General Category > Quadrajet Carb Talk and Tips

factory appearing stock tire drag racing

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Cliff Ruggles:
The 69 and later carbs will take a smaller float.  It really doesn't help.  The key is to improve fuel delivery to keep the carb full at all times.  Pretty easy for FAST, much harder for Stock.....Cliff

69 stingray:
i see, i need a fuel pump, fuel pump lines, and fuel inlet needle and seat big enough to meet the demands of my engine. any idea what cfm carb. came on my 427/390hp engine?

von:
69 Stingray I think you have to use a factory block in FAST. In the late 70's and early 80's I had a '69 Vette 390 hp 427 automatic I built into an NHRA B/SA class racer. I ran it as the 400 hp tri-power version. It ran a best of 11.28 in 1982. Won a couple class wallys and briefly held the 1/8 mile record. Sammy Pizzolato has it now. I used a 1/2" fuel line from tank to carb with elect pump at the back and a dummy (gutted) mech pump. It had no fuel pressure or volume problem. I'm not sure if you can change the fuel line diameter in FAST.

69 stingray:
hi von, thanks for the reply. yes you can change the fuel line diameter and run the electric fuel pump as long as it's hidden and appears stock. did you run the3931063 cast iron heads? i think pure stock you have to use the OEM block but in F.A.S.T. you can use an aftermarket block but not with siamesed cylinders and cubic inch limit is 560 unless you have a 429/460 BB ford which is 604 ci limit. 11.28 is very good what was the m.p.h.? i just picked up the aluminum Q-jet intake #3947801 for my engine, i have a 512 casting engine block but i really don't want to use it for racing since they are getting expensive to replace. please send me any and all information i need to get my car competitive, thanks again...

Cliff Ruggles:
Pretty sure that aftermarket blocks are not allowed in FAST.

Just got an email yesterday from my good friend and customer Jay Delaigle.  His 74 Pontiac Firebird is pictured on our website.

It's a legal FAST class car, using crappy Pontiac 4X heads, EGR iron intake, Q-jet, and "log" exhaust manifolds.

He went 10.89 @ 125mph yesterday.

The must run on 7" wide bias ply tires.....just amazing.

My contribution to the project are the carburetor, distributor, and transmission......Cliff

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