Re: quadrajet numbers needed
- "husband & wife",
IIRC, the early 472s and maybe 500s were divorced choke, and later
were not. Which you would need depends on which intake you have.
Divorced style would need intake that accepts the bi-metal spring
Not sure about Caddys, but there are two sizes of primary venturi on
Q-Js. Small one has smooth bore venturi. Big one has bumps on the
inner diameter of venturi. Easy to spot. Small flows apx 750, and big
apx 800, assuming air doors are opened full [not all were as such
> anyone know the casting number on the big caddy carbs from the
> I need the carb.
Fwiw, even an spreadbore holley will not match the economy of a well
tuned Q-J, and on a mild caddy, an 800 spread bore will probably not
make much, if any more power. The Holley power valve is pretty much
on or off. The Q-J's power piston makes for a more proper afr at all
throttle openings. Getting the afr curve right isn't an easy thing to
On a strip car, or if economy isn't an issue, Holley yes. Can a Q-J
do the job on a race car, yes, if you have the time/skill. Look at
NHRA stock class cars. Many are making big power with Q-Js. A Holley
is much easier to tune though, I admit.
> Ditch the quadrajunk and throw a holley on it.
- Finally got down to the shop and found the carburetor from the 74 472
engine. Its stamped Rochester Quadrajet. The only #s I could find on
exterior were: 7043234 and under that 10031. Hope that is helpful to you.
Re. getting it set up right: Getting harder and harder to find good
carburetor technicians as its been 20 years since carburetors were put on
----- Original Message -----
From: "husband & wife" <zonch90@...>
Sent: Wednesday, March 23, 2005 6:01 AM
Subject: [Cadillac_Performance_Association] Re: quadrajet numbers needed
> --- In Cadillac_Performance_Association@yahoogroups.com, "husband &
> wife" <zonch90@y...> wrote:
>> anyone know the casting number on the big caddy carbs from the
>> I need the carb.
> the high cfm carb guessing 75 or 76 ish i believe it flowed 100
> cfm more than a normal quad
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