Rebuild or replace 4-V carb on 289?
MM
I've got a '67 289 fastback since about 2 weeks now and it appears that the
carburetor is in need of a rebuild. It is (I think) the Autolite 4300 4-V
carb. It is leaking at the front, it misses the anti-stall dashpod, the
choke mechanism is incomplete, and performance is not what I expect from a
4-V (a 2-V 66 conv. is faster than me). Is it worthwile to rebuild this
carb or should I invest in a new carburetor? If so, what is the best choice
for a bit more performance, without sacrificing to much economy (gasoline
is $4 per gallon over here....) Thanks for any input.
Eric Berends, Huissen The Netherlands.
Nick Smith
buy a rebuild kit
sounds like your gaskets are leaking
MM <e...@euronet.nl> wrote in article <01bc9610$fa0f96a0$LocalHost@laserpc>...
Mark Conklin
Get a Holley 600 with vacuum secondaries. You won't be disappointed. You
may want to experiment with optional secondary springs though, but I'd
bet your mileage will go up!
MC
Tom HIWATT
>From: "MM" <e...@euronet.nl>
>Date: 21 Jul 1997 20:02:32 GMT
>Message-ID: <01bc9610$fa0f96a0$LocalHost@laserpc>
>
>I've got a '67 289 fastback since about 2 weeks now and it appears that
the
>carburetor is in need of a rebuild. It is (I think) the Autolite 4300 4-V
>carb. It is leaking at the front, it misses the anti-stall dashpod, the
>choke mechanism is incomplete, and performance is not what I expect from
a
>4-V (a 2-V 66 conv. is faster than me). Is it worthwile to rebuild this
>carb or should I invest in a new carburetor? If so, what is the best
choice
>for a bit more performance, without sacrificing to much economy (gasoline
>is $4 per gallon over here....) Thanks for any input.
>Eric Berends, Huissen The Netherlands.
>
The carb in 67 was still the Autolite 4100, which has a vacuum secondary
diaphram on the rear. The carb in 68 was the Motorcraft 4300, which uses
mechanical secondaries. Be sure of which one you have. The Autolite 4100
can be an excellent carb for performance and economy. On the driver's
side front of the float bowl you will see a number in a circle. 1.08
denotes the 470 cfm carb and 1.12 denotes the 600 cfm. The 1.08 is
perfect for your car.
It sounds as if your carb needs help. I would seek out a rebuilt
replacement 4100 over the Holley 600 as it will be more thrifty with the
gas. The 4100 uses the same power valve as the Holley, so you can tune
the power enrichment circuit. If this is a stock engine, you could send
the carb to Pony Carbs in the US for a rebuild. They seem to be good with
stockers. My personal experience with their work on 4100s for modified
engines was not good at all. You may be able to find a rebuilt carb from
many arb rebuilding companies as the 1.08 4100 is not a scarce part.
The Holley 600 cfm vacuum secondary or the Carter 525 AFB would be my next
choice. I have been using an Edelbrock Performer 600 (a Carter AFB clone)
with great results.
JK
I ran a Holley 600 cfm (model 1850) for several years on my nearly-stock
289. After several rebuilds and tweaks, I invested in an Edelbrock. I
don't recall the model, but the cfm is closer to 500.
Anyway, I feel the Edelbrock is a much better performer right out of the
box, both on the low and high ends. Mileage is about the same. Don't yet
know about the long-term reliability of of it yet, though. Also, I had to
install a spacer plate with the Edlebrock so that the linkage would
completely clear the valve covers.
I haven't had any experience with the Autolite.
Mark Conklin <CON...@worldnet.att.net> wrote in article
<33D3E3...@worldnet.att.net>...
MrFomoco
While I agree with most of Tom's comments, there are
a few points that should be corrected:
Tom HIWATT wrote:
>
> The carb in 67 was still the Autolite 4100, which has a vacuum secondary
> diaphram on the rear.
For the 1967 model-year, most 289s used Autolite's
brand-new model 4300 carb. Thge exception was the
289hp, which stayed with the old 4100s.
> The carb in 68 was the Motorcraft 4300, which uses
> mechanical secondaries.
The Autolite name was used for all components released by
Ford's General Products Division (GPD) through model-year
1971. The changeover to Motorcraft - at least for GPD,
which was responsible for Assembly parts - came @ May, 1971.
> Be sure of which one you have. The Autolite 4100
> can be an excellent carb for performance and economy. On the driver's
> side front of the float bowl you will see a number in a circle. 1.08
> denotes the 470 cfm carb and 1.12 denotes the 600 cfm. The 1.08 is
> perfect for your car.
The 289hp carbs were bigger than std. units - cast "1.12".
Also, there a few (pretty rare) Autolite 4100s cast with
"1.19"...accrordingly, they have larger Vs and flow-rate.
If anyone's interested, I have some 1.08 Autolites for
sale, in good-to-very good (rebuildable) condition. All
are competitively priced - some specific applications are
available, too, with the original Ford ID tags.
--
MrF
Allen Cross
------------------------------------------------------------------------
THE online source for 1960-1973 Ford information.
http://www.voicenet.com/~fomoco
Original articles, NOS stuff, tech advice & more!
Tom HIWATT
>From: MrFomoco <fom...@voicenet.com>
>While I agree with most of Tom's comments, there are
>a few points that should be corrected:
>
>Tom HIWATT wrote:
>>
>> The carb in 67 was still the Autolite 4100, which has a vacuum
secondary
>> diaphram on the rear.
>
>For the 1967 model-year, most 289s used Autolite's
>brand-new model 4300 carb. Thge exception was the
>289hp, which stayed with the old 4100s.
>
Ooops.
>> The carb in 68 was the Motorcraft 4300, which uses
>> mechanical secondaries.
>
>The Autolite name was used for all components released by
>Ford's General Products Division (GPD) through model-year
>1971. The changeover to Motorcraft - at least for GPD,
>which was responsible for Assembly parts - came @ May, 1971.
>
Ooops.
>> Be sure of which one you have. The Autolite 4100
>> can be an excellent carb for performance and economy. On the driver's
>> side front of the float bowl you will see a number in a circle. 1.08
>> denotes the 470 cfm carb and 1.12 denotes the 600 cfm. The 1.08 is
>> perfect for your car.
>
>The 289hp carbs were bigger than std. units - cast "1.12".
>Also, there a few (pretty rare) Autolite 4100s cast with
>"1.19"...accrordingly, they have larger Vs and flow-rate.
>
>If anyone's interested, I have some 1.08 Autolites for
>sale, in good-to-very good (rebuildable) condition. All
>are competitively priced - some specific applications are
>available, too, with the original Ford ID tags.
>--
>MrF
>Allen Cross
>------------------------------------------------------------------------
> THE online source for 1960-1973 Ford information.
> http://www.voicenet.com/~fomoco
> Original articles, NOS stuff, tech advice & more!
If I didn't already have some, I'd get one. Folks, they are a cinch to
rebuild.