READ THIS LINK FIRST!!!:

http://www.thecarburetorshop.com/Carbshop_carbsizesandCFM.htm

A PARTIAL chart of Rochester CFM ratings was published in the book "Rochester Carburetors" authored by Doug Roe:

In that chart one finds:

2G from 278 to 435

4G from 486 to 692

Remember that CFM numbers, TO HAVE ANY VIABLE MEANING, must specify the test criteria.

Mark Twain probably knew more about CFM tests than anyone. He wrote "Figures don't lie, but liars figure"!!!

Also remember that CFM of multiple carburetors is NOT an additive property. (eg. two 600 CFM 4-barrels probably will flow about 900 total CFM). Tripower is even worse (at least on a V-8).

Jon.


Good carburetion is fuelish hot air
The 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