Chevy heads...opinions please.
Mark McLean-Hall
Hi
I have just discovered that my powerless 350 (234bhp) has
got whats known as 283 "Power Pack" heads on it. I dont
have them off the car as yet, so I don't the number under
neath, but the number on the top was 333882. Does this number
mean anything to anyone. I understand that these heads were
basiclly small cc and valves, so only really good for low-speed
performance. I'm going to be doing some work on the engine soon
to boost the power up. Are these heads the way to go or should
I bin them...any comments and help with that number would be
appreciated.
Thanks
Mark.
--
***********************************************************************
* Mark McLean-Hall | Old Fords Never die.. *
* email m...@crosfield.co.uk | They just get faster. *
***********************************************************************
Nico Over
350/400 with 1.94int&1.5 ex valves but being used over many years they
could also have the 1.74 int/1.5 exh. If they have the 1.94 then they
would make a decent street head depending on your cam, headers carb etc.
From the sound of your post the problem may not be in the heads
themselves, assuming their in good shape, so you may want to look
elsewhere for the power loss. Best of Luck
sbl...@linknet.net
333882
1970-80 350/400's
intake cfm 137.2 exhaust cfm 95.4
1.94/1.50 valves 75.5 cc chambers
installed on 150,170 and 180 HP motors
These are not power pack heads and are often passed off as so due to
the fact that they have very simular casting marks on the side of the
heads.
If you have these heads ported and polished you will have a good set
of street heads but don't plan on winning may heads up races with
them. They simply can't flow as much air as the S/R tourqer.
I hate to have to tell you that but I would rather hurt your feelings
that your pocketbook!!!!!
Small Block
Chevy Mania
attgis
>==========Mark McLean-Hall, 07/10/96==========
>
>Hi
>I have just discovered that my powerless 350 (234bhp) has
>got whats known as 283 "Power Pack" heads on it. I dont
>have them off the car as yet, so I don't the number under
>neath, but the number on the top was 333882. Does this number
>mean anything to anyone. I understand that these heads were
>basiclly small cc and valves, so only really good for low-speed
>performance. I'm going to be doing some work on the engine soon
>to boost the power up. Are these heads the way to go or should
>I bin them...any comments and help with that number would be
>appreciated.
>
> Thanks
>
> Mark.
>
>
>--
>***********************************************************************
>* Mark McLean-Hall | Old Fords Never die.. *
>* email m...@crosfield.co.uk | They just get faster. *
>***********************************************************************
Mark:
The heads you describe are the run-of-the-mill Chevy 350 head,
before cost reductions. Sort of like belly buttons, everybody's
got one. They have 76 cc chambers, 1.94 intake and 1.50 exhaust
valves. Don't bother doing any work on these heads as they have
horrible intake ports. Find a set of earlier 350 heads with the
last three digits of the part number being 441. These were the
first of the 350 heads and they have the same specs. as the 882
heads but the intake ports are superior and worth spending some
time on. Of course you'll hear about 461 heads and Angle Plug
heads, but if simplicity, low end torque and reasonable cost are
some of your objectives these heads will do the trick. If you
want to do some modest port work and install 1.60 exhaust valves
you will end up with a pretty torquey (torky, I don't know!)
engine. My son runs a pair of these on his 400 ci Chevy in a
'79 Fairmont and he turns low 12's using a 270 degree hydraulic
cam amongst other things.
Good luck
Bill
Jorg Klinger
> Mark McLean-Hall wrote:
> >
> > Hi
> > I have just discovered that my powerless 350 (234bhp) has
> > got whats known as 283 "Power Pack" heads on it. I dont
> > have them off the car as yet, so I don't the number under
> > neath, but the number on the top was 333882. Does this number
> > mean anything to anyone. I understand that these heads were
> > basiclly small cc and valves, so only really good for low-speed
> > performance. I'm going to be doing some work on the engine soon
> > to boost the power up. Are these heads the way to go or should
> > I bin them...any comments and help with that number would be
> > appreciated.
> >
> > Thanks
> >
> > Mark.
I had a set of 882 heads and ported them. They were ok but certainly
not worth the work I put into them. The exhaust is particularely bad, with
a restriction cast in right around the guide. I tried to take too much out
of the exhaust and went right into the water jacket. The intake has some
flashing pockets right in the port, real ugly. OK for a mild torque motor,
mine was a 350hp/400, but not worth stainless, unshrouding, etc... for a
hipo motor.
--
Jorg Klinger
Arch.&Eng.
U.Manitoba
Leland Lewis
attgis <bill...@waterloo.attgis.com> wrote in article
<Dyytx...@attwat.Waterloo.NCR.COM>...
>
> >==========Mark McLean-Hall, 07/10/96==========
> >
> >Hi
> >I have just discovered that my powerless 350 (234bhp) has
> >got whats known as 283 "Power Pack" heads on it. I dont
> >have them off the car as yet, so I don't the number under
> >neath, but the number on the top was 333882. Does this number
> >mean anything to anyone. I understand that these heads were
> >basiclly small cc and valves, so only really good for low-speed
> >performance. I'm going to be doing some work on the engine soon
> >to boost the power up. Are these heads the way to go or should
> >I bin them...any comments and help with that number would be
> >appreciated.
> >
> > Thanks
> >
> > Mark.
> >
> >
> >--
> >***********************************************************************
> >* Mark McLean-Hall | Old Fords Never die.. *
> >* email m...@crosfield.co.uk | They just get faster. *
> >***********************************************************************
>
> Mark:
>
> The heads you describe are the run-of-the-mill Chevy 350 head,
> before cost reductions. Sort of like belly buttons, everybody's
> got one. They have 76 cc chambers, 1.94 intake and 1.50 exhaust
> valves. Don't bother doing any work on these heads as they have
> horrible intake ports. Find a set of earlier 350 heads with the
> last three digits of the part number being 441. These were the
> first of the 350 heads and they have the same specs. as the 882
> heads but the intake ports are superior and worth spending some
> time on. Of course you'll hear about 461 heads and Angle Plug
> heads, but if simplicity, low end torque and reasonable cost are
> some of your objectives these heads will do the trick. If you
> want to do some modest port work and install 1.60 exhaust valves
> you will end up with a pretty torquey (torky, I don't know!)
> engine. My son runs a pair of these on his 400 ci Chevy in a
> '79 Fairmont and he turns low 12's using a 270 degree hydraulic
> cam amongst other things.
>
> Good luck
> Bill
>
We are running 12's with a set of 882's slightly warmed over
and run them on all our Sportsman and Street class stockcars.
Why? Because 441's are hard to find and bring top dollar,
we have lots of 882's and we don't need the extra flow. The
882's work up to about 350HP.
If you find a set of 441's at a reasonable cost buy them, or if
you are building a killer engine but if you are on a budget you
can use that money to do some of the work that needs to be done.
Or look at a set of Dart SR's.
Lee
David J Phillips
Wow. Those chambers are usually about 57cc in volume. You must be
running dished pistons because the compression ratio with a set of 57cc
power pack heads on a 350 jumps to about 11:1 by simply bolting them
on! I would look around for a set of 64 cc heads (late 60's) for that
350. However, if you are running dished pistons, his will reduce the
compression ratio. You may be in for a piston change if those heads are
indeed early model power packs. Some early model 60's cars ran power
pack heads with a larger chamber, which is what I suspect your car has.
I assume you have been driving this car around, without having to stop
at the airport for 100+ octane fuel. If you can find the Fuelie heads
with 194 intake valves, you will significantly increase the performance
of that engine, and better yet, a pair of 2.02 heads would work even
better. Good luck on finding those types, most Chevy freaks would
rather sell their mother before they sold those to you. You can
purchase these types of heads in the aftermarket, but they will run you
a healthy $1000+ for a decent set that have been ported and polished.
Just my 2 cents
Dave
Patrick
David J Phillips (atl...@DavidP.reno.nv.us) wrote:
Gee, David, why don't you take your .02 cents and break it into a couple
of paragraphs so someone can read it. What a concept!
: Wow. Those chambers are usually about
: Just my 2 cents
: Dave
--
Patrick
mexi...@netcom.com
Moderation is a fatal thing,
Nothing succeeds like excess!
-Oscar Wilde
David J Phillips
>
>Patrick
>mexi...@netcom.com
>
>Moderation is a fatal thing,
>Nothing succeeds like excess!
>-Oscar Wilde
Ok Patrick,
How's this...
Byte me.
How's that?
Dave :)