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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#30174 05/19/2002 11:25 AM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Ok Fred, we all know relationships are difficult but......4 bbl carbs are rated for cfm at 1.5 Hg of pressure drop(vacuum)and 2 bbls are rated 3 Hg of pressure drop.To rate a 2 barrel the same as a 4 barrel a conversion factor of 1.414 can be used. So, for example,a Holley 500 cfm 2 bbl carb is 353 cfm if rated on a 4 bbl scale.The above information is from various carb tuning books. | | |
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