Vortec heads with TBI
pedro
hypertech chip, roller rockers,JBA headers, Edelbrock aluminum Valve
covers. So my first question is will the newer Vortec Heads fit these
accesorys. I want to do it right the first time,what other parts do I
need. Replacement intake manifold GM parts # ???? Vortec Heads parts
#????? EGR Valve swap???? Head gaskets, will the stock length push
rods work. I guess I should have started with is this swap worth the
money??? I am being told the Vortec heads for my use is as good as the
Aluminum Edelbrock heads for a lot less money. What your thoughts??
Thanks for any help
Allen Rexford
choice. The only diff. will be weight over the Aluminum.
HOWEVER, having a 1990 350......you already HAVE the vortec heads. The diff.
between the 86' and earlier is the deck angle, and swirl 'fast burn'
combustion chambers. The vortec MOTOR and the vortec HEADS are seperate. The
heads were used from 87' on.....the motor is from 96' (for fullsize GM) to
present.
Want a new upgrade? Try the Aluminum TBI intake from Edelbrock, bolt in a
swirl torque spacer under the TBI, and put a set of torque plus intake
gaskets on. Top it off with a K&N cold air induction kit. This comb will
increase your low and mid-range torque.......right where you can use it!
Good Luck!
"pedro" <cabo...@yahoo.ca> wrote in message
news:c076f66b.02122...@posting.google.com...
Merc
"Allen Rexford" <arex...@attbi.com> wrote in message
news:avmN9.463303$QZ.70911@sccrnsc02...
Allen Rexford
about 15%. Combined with the torque plus intake gaskets, about 25%. The only
thing the two do is to produce better atomization. And that is GREAT for the
low end where you use it on a street engine.
"Merc" <mach1...@nospamhotmail.com> wrote in message
news:3e05f...@bulkley.net...
Z16Monte
pattern is different as is port shape. I have a 94 and it has the 87-95
style intake. The Vortecs are based on the LT1 head but without reverse
cooling.
Sinner
of the center bolt heads. They LOOK like vortec heads but are not. They
came out in '86 to present and that's the same year you gave. That's why I
think you are thinking of the center bolt heads.
David Meek
"Allen Rexford" <arex...@attbi.com> wrote in message
news:avmN9.463303$QZ.70911@sccrnsc02...
Allen Rexford
heads.......they are diff from the LT1 heads, but are the same head used
today. You are thinking of the Vortec motor.....or what Chevy calls the
Vortec. The head design is the same as what came out in 87' & are referred
to as the Vortec head. As I stated, the heads and motor are two separate
entities.
"Sinner" <sin...@worldnet.att.net> wrote in message
news:3UpN9.9020$p_6.7...@bgtnsc04-news.ops.worldnet.att.net...
"Doc"
> The newer Vortec "style" heads (that ones for you Doc...lol) are a good
> choice. The only diff. will be weight over the Aluminum.
>
> HOWEVER, having a 1990 350......you already HAVE the vortec heads. The
diff.
> between the 86' and earlier is the deck angle, and swirl 'fast burn'
> combustion chambers. The vortec MOTOR and the vortec HEADS are seperate.
The
> heads were used from 87' on.....the motor is from 96' (for fullsize GM) to
> present.
Vortec heads are aluminum. The heads on 1987-1995 TBI SBC and BBC's are
CAST IRON. They are NOT Vortec heads my friend. Tell me this, if they are
already vortec heads, why does GMPP offer a Vortec UPGRADE kit for 1988-1995
GM TBI trucks? The Vortec kit contains the aluminum vortec heads and the
appropriate vortech TBI intake manifold. I don't mean to flame, but you're
way off base here.
The Vortec engines are dubbed such primarily because of the aluminum "vortec
style" heads. The engine guts are diferent as well with higher CR's
possible due to the aluminum heads but the primary difference in Vortec and
non-Vortec engines is the heads. Also, AFAIK, the Vortec engines were never
mated with a TBI system; they are mated with either CPI or MPFI systems,
which again supports the fact that 1987-1995 GM, TBI trucks do NOT have
Vortec heads.
> Want a new upgrade? Try the Aluminum TBI intake from Edelbrock, bolt in a
> swirl torque spacer under the TBI, and put a set of torque plus intake
> gaskets on. Top it off with a K&N cold air induction kit. This comb will
> increase your low and mid-range torque.......right where you can use it!
Oh my, TBI spacers and K&N air filters, this post just gets worse and worse!
<g> I guess you arrived AFTER I solved the nafarious K&N debate, proving
that they do nothing to increase power, provide the engine with dirtier air,
and lighten your wallet in the process!
> Good Luck!
Regards,
Doc
"Doc"
> Very little Hp from my understanding about 8%......but torque is good for
> about 15%. Combined with the torque plus intake gaskets, about 25%. The
only
> thing the two do is to produce better atomization. And that is GREAT for
the
> low end where you use it on a street engine.
25% increase in low end torque from a TBI spacer and intake gaskets????
Shit, and I've been wasting all my money on blowers! Seriously Allen, TBI
spacer and intake gasket kit could NEVER produce a 25% gain in low end
torque. I've dynoed these contraptions, they're good for nothing but
lightening your wallet.
Doc
"Doc"
> No, the Vortec heads came out in 87' & they ARE the center bolt
> heads.......they are diff from the LT1 heads, but are the same head used
> today. You are thinking of the Vortec motor.....or what Chevy calls the
> Vortec. The head design is the same as what came out in 87' & are referred
> to as the Vortec head. As I stated, the heads and motor are two separate
> entities.
Same heads eh? 1987-1995 were CAST IRON. 1996-present VORTEC heads or
ALUMINUM. Theyare not the same.
Doc
Allen Rexford
and newer heads are all based on the same design, combustion chamber, &
change in intake deck degree. You can, however, replace the heads with the
d-shaped combustion chambers w/ the fastburn design. The only difference is
the combustion chamber.
The LT1/LT4 are reverse coolant flow and the LS1 is a different style head.
The 'upgrade' on the GMPP is an upgrade from iron to aluminum, I'm pretty
sure. If you check this website https://www.spoperformanceparts.com/ you'll
find all the replacement heads you could ever need....it's GM's official
performance website. You'll find many heads.....including the cast iron
'vortec' and the aluminum 'vortec' head, and the standard 87'-95' cast iron
head, as well as the old "dbl hump" heads. The TBI intake from 87' to 95'
will fit either stock or 'vortec' head. I would assume that the "kit" is
only an upgrade from iron heads and intake to Aluminum heads and intake. The
vortec and non-vortec engines can use the same head. A vortec engine that is
NOT the gen III design (LT1,LS1,LT4,LS6...etc) can use the same head as the
95' and earlier.
Anybody that disagrees is welcome to visit the website and make your own
assumptions.
And yes, I'm afraid I did miss the big K&N debate. However, I run K&N
filters in all my vehicles and recommended them for any race engine I built.
My mild 350 produces 353 Hp and 486 Ft pounds of torque (90% between 2200
and 4500 RPM) I built it as a "stump puller" for my 3/4 ton truck. One of
the benefits of having worked for a racing company, is that I can usually
get some dyno time really cheap. The K&N filter kit delivered 5 Hp, 8 Ft
pounds torque, & 2 MPG. The swirl spacer delivered 3 Hp and 5 Ft pounds
torque (on a Q-jet carb). The intake gaskets were already on so I can't give
figures on if they did or did not produce anything, but for 34.00 bucks,
what the hell.
Sorry Doc, you may have proved the debate to someone else....but to me the
numbers don't lie. I know quite a few racers that have gained even more Hp
than me and will run nothing else. The company claims 10-15 Hp.....I have
known it to be as high as 26 Hp per the Dyno readout. Questions? Go to the
pits and look.....count how many paper filters you see and please post the
numbers. I have never known ANY to run anything other than an oil saturated
foam filter of some type.
Now, back to the original......I still maintain that the only upgrade he
would get is the d-shaped combustion chambers and swirl design....other than
that the head is the same as the vortec....either cast iron 'vortec' or
aluminum 'vortec'. The difference for his engine would not be worth the
300.00 per head performance wise.....maybe with a bigger cam, higher
compression and custom computer it would be...and definitely not worth the
cost of aluminum heads @ 600 ea. and up. As for the K&N filter.....and
spacer...... it's up to the individual....I have never seen less than 1 MPG
increase in mileage...usually 1.5-2 MPG, and a diff. in throttle response
you can feel...even without a dyno.
Sorry, I have built WAY to many SBC to fall for the common myths that run
rampant in these newsgroups. I even had a guy tell me once that you couldn't
mix and match rocker arm ratios.....until I pulled out the article and
proved it. I will only post good relevant information based on fact, not on
what I believe.
""Doc"" <ask...@no.spam> wrote in message
news:iJuN9.35930$3t6....@nwrddc03.gnilink.net...
Tim
> "Allen Rexford" <arex...@attbi.com> wrote in message
> news:avmN9.463303$QZ.70911@sccrnsc02...
>
> > The newer Vortec "style" heads (that ones for you Doc...lol) are a good
> > choice. The only diff. will be weight over the Aluminum.
> >
> > HOWEVER, having a 1990 350......you already HAVE the vortec heads. The
> diff.
> > between the 86' and earlier is the deck angle, and swirl 'fast burn'
> > combustion chambers.
Hold on a minnit!
The vortec MOTOR and the vortec HEADS are seperate.
> The heads were used from 87' on.....the motor is from 96' (for fullsize GM) to present.
>
> Vortec heads are aluminum.
Nope see p/n 12558060 Pace Performance
The heads on 1987-1995 TBI SBC and BBC's are
> CAST IRON. They are NOT Vortec heads my friend. Tell me this, if they are
> already vortec heads, why does GMPP offer a Vortec UPGRADE kit for 1988-1995
> GM TBI trucks? The Vortec kit contains the aluminum vortec heads and the
> appropriate vortech TBI intake manifold. I don't mean to flame, but you're
> way off base here.
> Hey Doc, check this site out;
http://www.paceparts.com/search.asp?7=vortec&1=Go
Looks to me like the vortec kit has cast iron heads. Methinks the kit
includes the aluminum TBI manifold, not aluminum heads.
Tim sends
Allen Rexford
406 Ft/pounds........
As I said in another post....anything looks right if you stare at it hard
enough.......LOL
Sorry for the fat fingers.....Guess I need to quit typing at 11:00 @ night.
Allen
"Allen Rexford" <arex...@attbi.com> wrote in message
news:kQxN9.273997$pN3.21630@sccrnsc03...
pedro
money to change the current heads to the 96 and up, whether that be
the GM Aluminum heads or the Edelbrock set up with the Edelbrock
intake manifold as my understanding is the the newer heads have a
different intake bolt pattern, and the heads they have a diffent
cooling circulation system. HAS ANYBODY DONE THIS SWAP. AT ABOUT $1400
TO $1600 FOR EDELBROCKS SET UP TO INCLUDE HEADS AND INTAKE MANIFOLD,
WHAT IS THE TRUE H.P. GAIN,WITH THE OTHER MODS I HAVE MADE. iF WASN'T
FOR THE FACT THAT THE ENGINE IS REBUILT I WOULD CONSIDER A CRATE
ENGINE IF I HAD TO DO IT OVER. I CAN NOT GO TO CRAZY AS MOST OF THE
TIME I CAN ONLY GET 87 OCTANE. THE CURRENT SET UP AS I HAD SAID IS THE
COMP CAM,HYPERTECH CHIP,JBA HEADERS,ROLLER ROCKERS,K+N FILTER SET UP
AND RUNS VERY WELL WITH THAT OCTANE . I DO NOT WANT TO CHANGE TO MPI,
SO BUCK FOR BUCK I AM THINKING HEADS,AND BECAUSE I LIVE 1000 MILES
SOUTH OF SAN DIEGO I HAVE TO GET RIGHT THE FIRST TIME, AS I FOUND OUT
WITH ALL THE PROBLEMS OF COMP CAM VALVE SPRINGS BEING WAY TO STIFF.
"""ONCE AGAIN THANKS FOR YOUR INPUT"""" PETER
Allen Rexford
the cam also, and go with the Edelbrock as a kit.......Heads, cam & lifters,
and intake.......Edelbrock will burn a custom chip for you......THAT would
be your best option for 1400.00 - to 1600.00......and Edelbrock will
guarantee the Hp numbers. About 400 Hp if I remenber right.
If your not going to change the cam.....don't bother with the heads......it
won't be worth the cost. With the stock cam.....you really don't need the
heads. Yours will breath just fine for your application.
Good Luck!
"pedro" <cabo...@yahoo.ca> wrote in message
news:c076f66b.02122...@posting.google.com...
Les
\"Doc\" wrote:
> "Allen Rexford" <arex...@attbi.com> wrote in message
> news:avmN9.463303$QZ.70911@sccrnsc02...
>
> > The newer Vortec "style" heads (that ones for you Doc...lol) are a good
> > choice. The only diff. will be weight over the Aluminum.
> >
> > HOWEVER, having a 1990 350......you already HAVE the vortec heads. The
> diff.
> > between the 86' and earlier is the deck angle, and swirl 'fast burn'
> > combustion chambers. The vortec MOTOR and the vortec HEADS are seperate.
> The
> > heads were used from 87' on.....the motor is from 96' (for fullsize GM) to
> > present.
>
> Vortec heads are aluminum. The heads on 1987-1995 TBI SBC and BBC's are
> CAST IRON. They are NOT Vortec heads my friend. Tell me this, if they are
> already vortec heads, why does GMPP offer a Vortec UPGRADE kit for 1988-1995
> GM TBI trucks? The Vortec kit contains the aluminum vortec heads and the
> appropriate vortech TBI intake manifold. I don't mean to flame, but you're
> way off base here.
Vortec heads are made from cast iron. Aluminum heads did not appear in trucks
until
the 1999 model year when the 5.3 engine started production.
Snowman
Untrue. '96 and up were vortec heads.
Snowman
Snowman
style Allen mentions.
Snowman
""Doc"" <ask...@no.spam> wrote in message
news:iJuN9.35930$3t6....@nwrddc03.gnilink.net...
>
shiden_kai
"Snowman" wrote
> Vortec heads are not aluminum. They are, however, different than the old
> style Allen mentions.
So...which "Vortec" engine are we talking about here?
Gen II sbc or Gen III sbc?
GenII are cast, GenIII are aluminum.
Ian
Merc
litre 350 motor in 1996. This I know for a fact and I am a Ford guy.
Merc
"Snowman" <rpar...@eaglecrusher.com> wrote in message
news:3e0c411a$0$17652$6d5e...@news.eurekanet.com...
pedro
So I think I have come to this conclusion if anybody else can help.
The 1996 was the start of Vortec heads,if that is so then what would
be the approx. HP increase of adding those heads to the 1987 to 1995
models. Do you need a different intake manifold, will the headers from
the 87 to 96 fit and the roller rockers from 87 to 95 fit the same
studs?? Last of all other than lighter and maybe better cooling, would
you put GM vortec heads or Edelbrock heads, other than cost. My little
understanding of the main differences of Vortec and non Vortec is
about 50 to 60 HP . So they could have only gained that increase by
the following, roller cam, MPI, better head design. As I don't need to
replace the short block and I have roler rockers, comp cam, JBA
headers, the swear word K+N filter, dual exhaust, a 5 year old
Hypertech Chip. I want to keep the stock TBI so. Are we still leaning
to intake manifold change and GM Vortec heads or Edelbrock set up. Is
there any problems with the EGR valve and the rest of my current parts
fitting either of the heads that we have talked about. Has anybody
compared the newer Vortec heads to the Edelbrock aluminium heads. Is
there a big difference in these heads to justify the cost which I
think is about double??/
Thanks again
Allen Rexford
Gen III motor started with the LT1,LT4,LS1,LT6......and more..........LEAVE
these heads OUT of the equasion....yes most are Aluminum from the
factory.....but we don't care, they wont help pedro.
Now, chevy makes four different style heads (Read style, not casting) that
will fit a SBC chevy......from 1955-present.....once again (read above)
except the GEN III motors.
First, Any old style casting from a SBC will fit....including the old "dbl
hump" heads will fit his motor, however, he would have to change intake and
run a carb, they don't make a TBI setup for older heads.....at least not
that I've seen.
Second, the Chevy cast iron centerbolt head. Which pedro has. This is the
base for the "Vortec" head. The only diff between it and the "Vortec" head
is the combustion chamber. This head was used with TBI intakes, having the
straight bolt holes instead of the slanted like the early castings. These
heads are used from 87' up.
Third, the cast iron "Vortec" head. These heads were produced in the early
90's, though I couldn't tell you exactly what engines they came on.......I
know the style of head was first used on a production vehicle engine in 92'.
This head will fit any SBC from 1955- present, once again....in case you
missed it.....except Gen III motors. And again, it's the same head as the
above centerbolt head, except the combustion chamber was improved.
Now, lastly.....the "Vortec" aluminum head. It is the EXACT same head as the
"Vortec" cast iron.......except......you guessed it,.....it's aluminum. The
aluminum heads were not used for prodction until 96' for most cases.
However, they would still fit a 60's SBC 327.....if you wanted to run the
new straight bolt intake pattern. They do make a Carb intake for these
heads.
Now, having said all that.....I'll have somebody tell me they make more
style heads than that........and yes.....they do. However, I just don't
think Pedro is going to run altered degree valve heads for NASCAR, or any
other mod. head on his street truck.....so to even bring them up would be
silly for this post. As would the 5.3.......see the GEN III comment earler.
I hope we have this settled.
NOW, PEDRO............if you have the comp cam......sorry if you mentioned
that earlier......I missed it. Then YES, move up to the Vortec heads. It
will be a great increase for you if your cammed. I don't recommend that you
spend the extra money for the aluminum heads though.....to much money for
your application. The cast iron vortec heads are about 250.00 ea and come
complete with springs, valves, retainers, and 3/8 rocker studs. You also
must use self-aligning rocker arms. I would guess that a rocker arm change
would be in order for you. EVERYTHING else will work just fine. No mods
needed. Top it with an Aluminum TBI intake for about 200.00, and you'll be
at about 1000.00 for everything. This should net you between 25-40 extra
horses.....maybe more. And, while your changing your rocker arms, you may
think about moving to a 1.6 ratio. It's up to you.
Hope all this has helped you. Good Luck!
"Snowman" <rpar...@eaglecrusher.com> wrote in message
news:3e0c411a$0$17652$6d5e...@news.eurekanet.com...
Merc
"Allen Rexford" wrote in message
Top it with an Aluminum TBI intake for about 200.00, and you'll be.....snip
My stock 94 Chevy 350 TBI has an aluminum intake -they all do. I'm still not
buying into your theory of vortec heads being available in 92 - they were
not on Chev or GMC trucks until 96.
Merc
http://www.geocities.com/fordguru69/Mach1Muscle.html
Merc
First, Any old style casting from a SBC will fit....including the old "dbl
hump" heads will fit his motor, however, he would have to change intake and
run a carb, they don't make a TBI setup for older heads.....at least not
that I've seen.....snip
I put a 1974 350 engine into a 1990 GMC truck- we used the TBI intake on the
old chev block - I think there were 2 bolts that would not line up - it
sealed up easily without them and ran perfectly.
Merc
"Allen Rexford" <arex...@attbi.com> wrote in message
news:ZTlP9.482463$%m4.1...@rwcrnsc52.ops.asp.att.net...
Merc
"Allen Rexford" babbled forth....
> Now, lastly.....the "Vortec" aluminum head. It is the EXACT same head as
the
> "Vortec" cast iron.......except......you guessed it,.....it's aluminum.
The
> aluminum heads were not used for prodction until 96' for most cases.
> However, they would still fit a 60's SBC 327.....if you wanted to run the
> new straight bolt intake pattern. They do make a Carb intake for these
> heads.
These 96 and later vortec heads ARE NOT ALUMINUM on the GM 5.7 truck
engines. My buddy has a set from a 98 GMC truck on his 68 Camaro 327 along
with the special intake to make them work and I can assure you that they are
cast iron. By the way, he has them for sale. He's going back to the 2.02
double bumps. He's selling the vortec heads, intake, valve covers etc. as a
package. (In BC Canada)
Merc
<arex...@attbi.com> wrote in message
news:ZTlP9.482463$%m4.1...@rwcrnsc52.ops.asp.att.net...
pedro
Thanks Snowman, now that we have gone this far, you feel that the comp
roller rockers that i have will not fit the newer heads, sounds like
the headers will, would you suggest buying the heads from GM and the
intake manifold. If not which supplier do you recommend and possible
parts #'s.
Thanks
Allen Rexford
intake That's why I recommend the intake. Second, If you read the
post.......I never said they were used on trucks......only that they were
used on some engines in 92' mostly cars, but I would never say they were not
used on some trucks.....I just have never seen EVERY truck produced, so I
cannot say.
"Merc" <mach1...@nospamhotmail.com> wrote in message
news:3e0e0...@bulkley.net...
Allen Rexford
slanted, they ran in at about a 45 or so degree angle. The heads from 87'
and up used the centerbolt design, and the intake bolts run into the head
straight up and down......there are no center intake bolts to the new
heads....so you would have had 4 bolts that didn't line up because they
would have been no holes.
Secondly, I doubt it ran perfectly, because the computer would not have been
designed to run with this engine and the signals would not be
right.......I'm not saying to couldn't happen, only that you would be
extremely lucky to have the cam profiles match close enough to have the
computer understand it.
"Merc" <mach1...@nospamhotmail.com> wrote in message
news:3e0e0...@bulkley.net...
Allen Rexford
aluminum.....only that they became more common in everyday driver
applications, (hence, the most cases statement).
Now, if you go back and read my post VERY carefully, my answer was related
to Pedros 1990 350 and the possible heads for his combination. NOT, when,
where, and how Chevy decided to put what head on which engine. Remember,
there are ALWAYS exceptions to EVERY rule of thumb.......my post only stated
the most common applications for Chevy designs.
Once again....for info on Chevy heads go to:
https://www.spoperformanceparts.com/ This is Chevys official online parts
ordering site for performance parts and engines. They will list what heads
will fit what engines. OR go to www.jegs.com for more info on the heads.
"Merc" <mach1...@nospamhotmail.com> wrote in message
news:3e0e0...@bulkley.net...
>
Allen Rexford
with the 552 head casting........the intake bolts are at 90 degrees, except
the center two which are at 72 degrees. You have to machine the intake
surface to allow the bolts to line up correctly. THAT is the difference for
the 87' - 95' 552 casting, and the Vortec heads have the straight up and
down bolts. I stand corrected.......even if I had to do it
myself.......lol.
SO, in essence, Pedro would still need the new intake with the Vortec heads.
As I recommended.
I still stand by the rest of the post.
"Allen Rexford" <arex...@attbi.com> wrote in message
news:S1sP9.484515$WL3.126385@rwcrnsc54...
Allen Rexford
prior.
"Snowman" <rpar...@eaglecrusher.com> wrote in message
news:3e0c411a$0$17652$6d5e...@news.eurekanet.com...
Merc
engines. It's great that you think you know everything about Chevy cyl.
heads but you are mistaken.
Merc
"Allen Rexford" <arex...@attbi.com> wrote in message
news:yssP9.486597$%m4.1...@rwcrnsc52.ops.asp.att.net...
Allen Rexford
only finished it. I gave Pedro the info he was looking for, not my buddy had
this or that........Pedro prolly don't care what came on your buddies
truck...or what year it came out in....only what is best for his
application. IE...... that would be the cast iron vortec with a new intake.
And I'm sorry......I post to the alt.chevy.truck newsgroup......I'm sure
that will be TOTALLY diff than the alt.chevy.car newsgroups.......cause we
all know that Chevy truck motors and Chevy car motor are COMPLETELY
different, not to mention 4X4's........woooo, complete class of thier own.
AND......why would a let someone named .....mach1muscle......(merc).... tell
me about chevy parts..............I have 18+ years experiance on
SBC's......maybe the FORD newsgroup is more to your liking and
experiance.............I might cut you some slack if you can tell me why
they call the heads 23 degree heads? Or 18 degree heads.......this would be
a Chevy thing.............tell me of your experiance with Chevy
heads......not your buddies.
"Merc" <mach1...@nospamhotmail.com> wrote in message
news:3e0e5...@bulkley.net...
Allen Rexford
330545.....73......350..........76cc chamber, 2.02/1.60
333881.....74-75...350..........76cc chamber, 2.02/1.60
333882.....74-80...350/400......76cc chambers
340292.....70's.......Over the counter, angle plug, 64cc chamber
354434.....75-79...262/267/305...60cc chambers
358741.....76-79...305
376445.....77-85...350..........76cc chamber, small valves
376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber
462614.....77-79...305..........60cc chamber
462624.....75-86...350/400......76cc chamber, 1.72/1.5, 1.94/1.5 or 2.02/1.6
valves
458642.....75-84...350..........350
468642.....76-up...350/400
471513.....79......267/350
517513.....79......267/350
1816887....63......283..........Made in "Canada", GMC HD truck
3636839....55......265
3703523....55......265
3713358....55-56...265
3713569....55-56...265
3725306....56......265
3731539....57......283..........283 HP FI
3731544....57-61...283
3731554....57-62...283
3731556....57......283..........Truck, Made in Canada
3731762....56......265..........Vette, 2x4 carbs
3737775....62-67...283/327
3740997....57......283..........1x4, 2x4 & FI (exc.-283hp)
3743056....58......283
3743096....62-67...327..........GMC Truck
3747363....57-61...283
3747460....59-67...283/327......70cc chambers
3748770....58......283
3748772....58-61...283
3755537....57-62...283
3755539....58-62...283
3755549....57-62...283
3755550....59......283
3755585....62-67...327..........GMC Truck
3767462....62-67...327
3767465....59-61...283
3767754....59-61...283..........60cc chambers
3767792....60-64...283
3774682....60-64...283/327......70cc chambers
3774684....62-64...327..........75cc chambers
3774692....58-64...283..........60cc chambers
3782461....64-66...327......Camel hump,no accessory holes,160/62cc port
volumes,62cc chamber
3782461X...60-63...283/327..Camel hump,no accessory holes,larger 172/64cc
port volumes, 62cc chamber
3795896....63-65...283......60cc chamber
3795896....62-64...327......60cc chamber
3798996....63-67...327
3814480....60-67...283/327..70cc chambers, 1.72/1.5 valves
3814482....62-67...283/327/350..75cc chambers
3817680....63-67...283/327
3817681....62-67...327
3817682....61-62...283
3836839....55......265
3836842....57-67...283/327
3837064....56-62...265/283
3837065....55-56...265..........Truck
3848720....57-58...283
3876775....60-67...283/327......75cc chamber
3884520....60-67...283..........Some marked "Made in Canada", 60cc chamber,
also used by Studebaker
3884520....62-67...327..........Some marked "Made in Canada", 60cc chamber,
also used by Studebaker
3890462....66-67...302/327/350..Camel hump,no accessory holes,64cc chamber
3901068....87-up...350..........Crate motor, 285hp, 64cc chamber
3911032....68......307/327......70cc chamber
3912264....58-62...283
3912265....63-64...283
3912311....65-67...327
3912313....65-67...327
3917290....67-68...307/327
3917291....67-68...302/327/350..Camel hump,no accessory holes,64cc chamber
3917292....68......327/350......Camel hump,64cc chamber
3917293....68......307/327......75cc chambers
3927185....69-76...307/327/350..70cc chambers
3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes
3927187....69-70...350..........Camel hump,64cc chambers,accessory holes
3927188....69......327..........74cc chambers
3927188....70......307..........74cc chambers
3931633....68-73...307
3931635....68-76...350
3931638....68......327..........Truck
3932441....69-70...350..........76cc chambers
3932441X...69-70...350/400......80cc chambers
3932454....69-73...307
3932454....69-79...350..........Truck
3946812....69......350
3946813....69-79...350..........Truck
3947040....68......327.........."Right angle" casting identifier, 64cc
chambers, good HP head,
used in trucks, no accessory holes
3947041....69-70...302/350......"Right angle" casting identifier, 64cc
chamber, accessory holes, good HP head
3947041X...69-70...302/350......"Right angle" casting identifier, 64cc
chamber, 165cc intake port, accessory holes, good HP head
3951598....70......400..........76cc chambers
3964286............350
3965742....70......350..........over the counter, angle plug
3970126....67-71...327/350
3973370....69-70...350..........over the counter, 64cc, straight or angle
plug
3973414....70......350..........LT1-370hp, Camel hump, 64cc chamber
3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber
3973487X...71-72...350..........75cc chamber
3973493....71-72...400..........76cc chamber
3986316....71......350..........76cc chamber
3986336....71......350..........76cc chamber
3986336X...71......350..........76cc chamber
3986339....71......307/350......74cc chamber
3986339X...71......307/350......74cc chamber
3986388....68-76...307/350
3991492....70......350..........LT1,Camel hump,accessory holes,64cc,
straight plug
3991492....70-up................over the counter,Camel hump,64cc, straight
or angle plug
3998916....72......350..........also used w/'72 350 LT1,big valves, screw in
studs,76cc chambers
3998920....72-73...350
3998991....72-73...307/350......75cc chambers
3998993....72-73...307/350......75cc chambers
3998993....current..350.........Goodwrench crate motors,"Hecho en
Mexico",75cc chambers
3998997....72-73...350/400......76cc chambers
3998997....78-84...305/350......76cc chambers
4079261....75......350
10033867........................Aluminum,over the counter Pontiac 23'
head,62cc,angle plug, 196cc intake port
10045434........................Over the counter Pontiac 15' head
55cc, angle plug, raised runner
aluminum, "roll over" head
10051101........................Bowtie, aluminum, 55cc, angle plug
raised runner, 196cc intake port
10065202...87-95...350..........Truck
10065203...87-95...350..........Truck
10065204...87-95...350
10065205...87-95...305
10065206...87-95...350
10065207...87-95...305
10088113...88-up...350..........Aluminum, 58cc, angle plug, raised
"D" port exhaust, 1.94"/1.5" valves
10093328........................Over the counter, Pontiac 15' head
aluminum,224cc ports, 61cc chambers,
"roll over" head
10106178...90......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10106179...90......350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10110810...91-up...350..........Gen. 1
10120928...87-95...350
10125320...94-96...350..........Gen.II LT1, cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
10128374...92-up...350..........Gen.II LT1, 53cc, angle plug,
aluminum, reverse flow cooling,
175/68cc ports
10134352........................Bowtie, 45cc, angle plug, "low"
port, 223cc intake port, aluminum,
18' race head
10134363........................NOTE: This casting # has been used
in many different versions of this
aluminum 18' and 15' Bowtie race head.
Different chamber volumes, port
volumes, port locations, valve sizes,
etc. were used. Check this casting
carefully to determine which features
it may have. There are at least 6
different versions as of 11/99.
10147898...95-98...350..........Gen.I crate motor
10159550...87-95...350
10159551...87-95...305
10159552...87-95...350
10159553...87-95...305
10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10185040........................Bowtie, aluminum, 45cc chambers,
1st version, symmetrical ports,
263cc intake ports, splayed valves
10185040........................Bowtie, aluminum, 45cc chambers,
2nd version, symmetrical ports,
240cc intake ports, splayed valves
10205245...93......350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10207643...94-96...350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10208890...94-96...265..........Gen.II, L99, 4.3 Liter V-8, cast iron,
reverse flow
10215339...97......350..........Gen.III, LS1, aluminum, 68cc
10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10225122...95......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10239902...96-up...350..........Gen.II LT4, aluminum, reverse
flow cooling, 195cc port, 54.4cc chamber,
angle plug
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
12367712...99-up................"Fast Burn", aluminum, 210cc intake,
port, 2.00/1.55 valves, 62cc chamber
12367713...99-up................"Fast Burn" used on ZZ430 crate motor,
aluminum, 210cc intake
port, 2.00/1.55 valves, 62cc chamber
12480005...2000.................LS1 "GTZ", aluminum, 38cc, 2.125"/1.625"
valves, angle plug
12480011...97-up................Bowtie "SB2.2", aluminum, 2nd
version of "SB2", 48cc chambers,
"mirror ports", revised valve
angles & plug location
12506450...87-95...350
12509859...87-94...305
12516852...87-95...350
12551561...96......350..........Gen.II, "LT1", aluminum
12552520...97-up...305..........Vortec, truck
12554290...94-96...350..........Gen.II, "LT1", cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
12555690...96......350..........Gen.II, "LT4", aluminum
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5,
170cc intake port
12558806...97-98...350..........Gen.III, "LS1", aluminum, 68cc
12559853...99-up...350..........Gen.III, "LS1", aluminum, 68cc
12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
12564243...02......350..........Gen.III, "LS6", aluminum
14008856...79-81...267
14094093...86-88...350
14010201...82-85...305
14011034........................Bowtie, cast iron, 64cc chambers,
184cc port volume, angle plug,
"Phase II" head
14011049........................Bowtie, aluminum, 55cc chambers,
angle plug, 180cc ports, "Phase 6"
14011083...55-86...350..........Crate motor for years indicated.
285/300hp, 64cc chambers, 1.94"/1.5" valves
14014415...80-85...267/305
14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers
14014440...80......305..........1.84"/1.5" valves
14019821...80-86...350
14019924...79-81...267
14019926...80-86...350
14010516...80-86...350
14020517...80......350
14020555...81......305
14020556...81......350
14022056...85......350
14022206...80......350
14022301...80-86...305
14022601...80-86...267/305......1.84"/1.5" valves, 58cc chambers
14022801...80-86...305
14024816...........350..........76cc chambers, 1.94/1.5 valves, Gen.I crate
motors
14034806...78-82...267
14034807...78-86...305
14034808...80-86...350
14034808...96-up...350..........76cc chambers, 1.94"/1.5" valves, Gen.I
Goodwrench crate motors
14034810...80-86...350..........Truck
14034811...80-86...350..........Truck
14039121...81-86...305..........Truck
14039122...81-86...305..........Truck
14071114...80-86...350
14075381...80-86...350..........Truck
14079261...86......350
14085844...80-86...350..........Truck
14085963...86......350
14089119...86-88...350
14094093...86-88...350
14096217...55-86...350..........Crate motor, 285hp/300hp, 64cc chambers,
72' or 90' center intake manifold bolt angles
14101081...87-95...305
14101083...87-up...350..........Gen.I, also used on crate motors, 285 or 300
hp, 64cc
chambers, 72' center manifold bolt
angles
14101128...86-87...350..........Aluminum, 58cc, angle plug
14102187...87-91...305..........1.84"/1.5" valves
14102191...87-up...350
14102193...87-up...305/350......1.94"/1.5" valves
24502559...96-97................Bowtie, "SB2", 1st version,
"mirror ports", aluminum, 196cc port, CNC
version 280cc port, 38cc chamber
25500141........................Buick/Chevy aluminum 10' head,
42cc chambers, symmetrical ports,
235cc intake port volumes,
2.1"/1.625" valves
33417369...90-up...350..........Gen.I Goodwrench crate motor,
"Hecho en Mexico", 76cc
pedro
Thanks gentlemen i think i am finding out what a news group is all
about, I do appriciate any input. I am just trying to get up to 1996
HP spec's that will not be a headache.I seem to be geting a higher
yes's then no's. I THINK???? I have also written to a few of the
companys that sell heads, as that is all the specialize in. P.S.. But
can I even trust supplyers?? Word of advise I learned the hard way,
don't put Comp. cam springs in a steet motor, I have a maybe 220 hp
way to much spring. They are as I had said way to stiff, it sounded
like I had solids all the time, and they could not pump up the comp.
lifter for at least 10 sec's. Hope I can help someone on that future
problem. You have no idea how many parts that I changed out till I
found that one.P.S. Allen Rexford was right on there is differences
between the car and the trucks. 1000 miles later found out that the
Chrome Valve covers that I bought fit the car not the truck in 1990.
All the openings >3 of< are in the wrong place.
Gracias From downtown Cabo San Lucas
Z16Monte
aluminum head l98s all were cast iron centerbolt heads with standard GM port
and combustion shapes. Caprices used carbed 307olds or 305 chev motors or
tbi 350s using cast iron center bolt heads with standard port and combustion
chamber shapes. The LT1 came about in 93 and used heads and port shapes
unique to it( also reverse cooled,so not useable on other Chev V-8
motors.)The LS1 debuted in 96 or 97 in the Corvette. No interchange between
it and other GM engines.The 88-92 GM trucks used the same heads as the
passenger car lines, continuing to use then until 96 when the L31 Vortec
engine family made its debut, utilizing the same port and combustion chamber
shape as the LT1 but with standard cooling.The only externally visible
change is in the intake manifold bolting surface which uses 4 bolts per side
rather than 12. It is the combustion chamber shape and port shape that
defines the Vortec head.Btw the L30 Vortec used on the 305 didn't have the
superior combustion chamber shape or port shape of the L31. but still used
the8 bolt manifold(I think).
"Allen Rexford" <arex...@attbi.com> wrote in message
news:yssP9.486597$%m4.1...@rwcrnsc52.ops.asp.att.net...
Merc
me. First off. Doc told you that you were crazy thinking a swirl carb spacer
would give you a 25% increase in torque. And he is absolutely right. Then
Z16 Monte pointed out that the vortec head came out in 1996 on the trucks,
and he is right as well.(and you are wrong) There are many others in this
newsgroup who know that you are stating incorrect information and they have
far more knowledge than I. You are right, I am a Ford guy who just bought
his first Chevy last year. But my source of information is a GM Tech. who
won the hands-on competition for all of Canada last year. I trust his
information a lot more than yours. He laughed his ass off when I told him
about your claim of 25% from intake gaskets and a swirl spacer! What a joke!
I told you about the 74 350 we put in a 1990 truck and you doubted it would
run. Do you think the TBI is so advanced to actually give a shit what kind
of block is bolted underneath it? The 1974 motor started and ran perfectly
with the TBI attached. The TBI is a very simple form of fuel injection. In
his last post Z16Monte has pointed out some more of your errors, I believe
he has the correct info.
Merc
"Allen Rexford" <arex...@attbi.com> wrote in message
news:8CvP9.367220$GR5.1...@rwcrnsc51.ops.asp.att.net...
Merc
.............I might cut you some slack if you can tell me why
> they call the heads 23 degree heads? Or 18 degree heads.......this would
be
> a Chevy thing...........
OK, let's get into the theory behind 18 degree heads. The number refers to
the angle of the intake and exhaust valves in relation to the head's deck
surface. By contrast, conventional small block Chevy heads have a valve
angle of 23 degrees.
So what's the big deal about 18 degrees? The shallower valve angle allows
the cylinder head designer to use a smaller volume combustion chamber to
help boost the engine's compression ratio without going to large-dome
pistons.
Does that answer your question Allen?
"Allen Rexford" <arex...@attbi.com> wrote in message
news:8CvP9.367220$GR5.1...@rwcrnsc51.ops.asp.att.net...
pedro
is returned any suggestions?????
William R. Walsh
> they were
> not on Chev or GMC trucks until 96.
Then what does my dad's '94 Chevy with 4.3L V6 have? The engine says
"Vortec" down the sides, but I'm not sure what that term all covers in this
case...
William
Allen Rexford
would interchange......just that they were in use prior to..........the L31
is based on the LT1 one head.....of course they wont interchange because of
the cooling, but it IS the same head design....and it was first used in 92.
I made a mistake in saying that Pedro had the Vortec heads....meant to say
his heads were new enough to do for his application........I don't have much
experiance with the 552 casting.....only know that the intake used a diff.
bolt set-up, but never looked to see the diff. until this post.
And yes William.....you are right.....the Vortec 4.3 was put in use in
94'....sorry I left that out......another one of those exceptions to the
rule of thumb.
And also.....good job Merc......your friend really knows his stuff.......I
can make some calls if he would like a job at MADCAP Racing
"pedro" <cabo...@yahoo.ca> wrote in message
news:c076f66b.02122...@posting.google.com...
Merc
buddy does know his stuff. It was him who convinced me to buy the 94 Chev
4x4 I have now over the same year Ford. He said something about the Chevy
4x4 IFS being superior to the Ford Twin Traction Beam.
Merc
"Allen Rexford" <arex...@attbi.com> wrote in message
news:lnQP9.496631$WL3.129274@rwcrnsc54...