Carb CFM guess

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Brooks James

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I know the smaller venturi are 278 CFM
Theres no number in the Larger venturi carb
The coating Im using Is the factory Cadminum gold
CFM Guesses , Meabe 400 cfm ???

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if the venturi is 3/8 and the throttle plates are 1 &11/16 its called a 485 cfm /500cfm in the books we need this information to size it/ does it fit the 318 on 360 intake
 
if the venturi is 3/8 and the throttle plates are 1 &11/16 its called a 485 cfm /500cfm in the books we need this information to size it/ does it fit the 318 on 360 intake
Itz a rochester the linkage Is chevy
I think you are thinking the 70 or so Larger two barrel. The butterflies are about
1. 1/2 and i dinat know how to measure the venturies, the carb in question have. 1/3 Larger venturies Than. the smaller ones

That Sound luke the Larger 2gc
 
they have several cfm sizes/ some are 325/365/425 and 485 each gm division had a different size carb for engine the 1 11/16 /3/8 venturi is rare and only came on the 400 and up 2 barrel cars / and hd 350 engines on school buses dump trucks ,and some 350 engines with 3&4 speed cars
 
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