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Author Topic:   Quadrajets
David Fowler
Dirt Newbie

Total posts: 4
posted July 29, 2002 02:58 PM
Hey can anyone give me a rough guess on what cfm a quadrajet off of a 1969 Buick 430 would be? Thanks

[This message has been edited by David Fowler (edited July 29, 2002).]

ryan
Dirt Freak

Total posts: 430
posted July 30, 2002 12:17 AM
I think most quadrajets ran from 750-800 cfm

KPLugnut
Dirt Freak

Total posts: 408
posted July 30, 2002 09:53 AM
ALL quadrajets were either 750cfm or 800cfm. Most were 750cfm. The few you'll find that were off big blocks (and had the fuel inlet coming straight in the front instead of in from the side) were 800cfm.
However, there were some with that fuel inlet style that also were 750cfm.
The only sure way to tell is to look into the primary venturi and see if there is a "bump" in there on the outside of the narrowest part. Hard to describe, but once you see one, you'll know it. It's visably larger in diameter than the 750cfm carb.

Hope that helps,
KPLugnut

David Fowler
Dirt Newbie

Total posts: 4
posted July 30, 2002 11:45 AM

Whats you guys opinion on the best Quadrajet to rebuild for a descent bomber motor?

KPLugnut
Dirt Freak

Total posts: 408
posted July 30, 2002 01:04 PM
Any 750cfm quad from '67 up thru the mid-70's (non emmissions) will be fine for a motor like that. The nice thing about the quadrajet is it only feeds what the motor asks for, and 750cfm is all the typical bomber motor needs.
Keep in mind, bigger is not always better with carbs.

Hope that helps,
KPLugnut

David Fowler
Dirt Newbie

Total posts: 4
posted July 30, 2002 02:39 PM
So do you think my Carb off the old buick would be a good place to start? I bought off of e-bay for 10 bucks plus shipping and handling! I didn't figure i could beat that! Any quad's you know to work better than other model's? Thanks again - David

KPLugnut
Dirt Freak

Total posts: 408
posted July 30, 2002 03:09 PM
Sure, it'll work fine for you. Just rebuild it or have it rebuild for racing. Therein lies the tricky part, as quadrajets can be quite temperamental if not set up right.

Good luck and if there's anything we can help with, just ask.

KPLugnut

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