General Category > Quadrajet Carb Talk and Tips

CFM of quadrajet?

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jaros44:
17082226
1372DUU
NUMBERS ON CARB
How can I tell what CFM this carb is?

Sonny:
Measure the primary venturi
If 1 and 3 32 inches it is 750
If 1 and 7 32 inches it is 800

Cliff Ruggles:
It will be the larger casting, but not flow anywhere near 800 cfm as the stop doesn't allow the air flap shaft to open very far......Cliff

jaros44:
20190220_093425

[url=https://flic.kr/p/24eCfZ4]20190220_095935 by James Jaros, on Flickr

I'm reading 1.355 on my calipers...what am I doing wrong?

Cliff Ruggles:
You are measuring the diameter of the throttle plates.  Measure in the main castings just below the outer booster rings or the restrictions or choke point at the venturi.....Cliff

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