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02-12-2017, 11:38 AM
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#7 |
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Senior Member
Join Date: Sep 2007
Location: Henderson, NV
Posts: 583
Likes: 8
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Re: Rochester 2gc - Chevy 400
Under vacuum, 3" was used for 2 bbl since originally at WOT that was about the vacuum achieved; 1.5" was used for 4 bbl carbs. The conversion factor is discussed in Doug Roe's book, and for example the 1-3/16" venturi carbs would give 247 cfm on the 4 barrel scale, 1-5/16 about 299, and the 1.25" iirc around 280.
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