General Category > Quadrajet Carb Talk and Tips

Q Jet on built Buick 455

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carmantx:
I don't have a flow meter to measure.  I am told the Buick carb will flow about 830cfm in stock form.  On mine, I cleaned up the casting marks and opened up the primary side some.  I take out the choke components, and verify the opening of the secondaries.  Both on the base plate and the air valves.

Cliff Ruggles:
Those carbs actually flow 850cfm without porting or grinding on them anyplace, which I don't recommend anyhow.

Plenty of carburetor for what you are doing.  You will need a superb fuel system to keep it full on hard runs, which is really the deal breaker with big HP.

One also has to consider how little time the engine really spends at high rpm's when you drag race it, or make a hard pull on the street with it.

I use a 1977 Pontiac q-jet on my 455, it's about the same power output as you are building, and it outran a Holley 4781-2 850 DP on the dyno and at the track.  I've also tested it back to back against several other big Holley style carburetors and including a very well set up HP950 and a custom built Holley it still ran quicker at the track with the Q-jet........Cliff

JayZee88:
im glad to know I won't be starving my 455 of fuel. Is there a electric choke conversion for the Qjet? I am putting headers on and its going on a street/strip 70 Electra.

carmantx:
The 76-80 Buick quadrajets were hot air choke and 800 cfm.  They can be converted to hot air choke.

JayZee88:
Is there a electric choke conversion kit for earlier qjets?

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