quick fuel carb

1

1931flathead

Well-known member
does any one know any thing about them ???

trying to find the size of one no marking on the air horn
 

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Based on eyeballing the venturi diameters I would say about 700 CFM if it has about 1 9/16" throttle bores, and about 750 if it has 1 11/16" throttle bores. Hard to tell without those measurements. Holley flows and rates their 4 barrel carbs at 3" H20 WOT. Not sure about Quick Fuel. If rated at 2 " H20, the flow will be higher.

Sal
 
If it's on a 302, it's a lot of airflow especially since it has mechanical secondarys. Unless your running over 7000 RPM on a high horsepower 302, you would be a lot happier with a smaller carb. Better throttle response on the street and more low RPM torque.

Sal
 
scicala said:
If it's on a 302, it's a lot of airflow especially since it has mechanical secondarys. Unless your running over 7000 RPM on a high horsepower 302, you would be a lot happier with a smaller carb. Better throttle response on the street and more low RPM torque.
Sal
Click to expand...

1931flathead, here's a link to a DIY carb cfm calculator...
A 400 to 500 cfm carb with vacuum secondaries will likely serve you better.

https://www.summitracing.com/expertadviceandnews/calcsandtools/cfm-calculator
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The carb you are putting smaller jets in may have another issue, like a ruptured power valve possibly. A 600 vacuum secondary carb would be a lot better than the 750.

Sal
 
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