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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | I have not seen published ratings on the Rochester B (there is NO Rochester C, and never has been).
The published rating on the M (superseded the B) with the 1 7/32 main venturi (this size used on the Chevrolet 216) was 160 CFM
1 barrel and 2 barrel carburetors are rated at 3.0 inches of mercury.
4 barrel carburetors (until greed in marketing took over) were rated at 1.5 inches of mercury.
The mathematical conversion factor is the square root of 2 (1.414).
Dividing 160 by 1.414 gives 113 CFM when converted to the scale most folks refer to.
Jon
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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