Almost all if not all 75 and later Pontiac Carbs are 800 cfm.Most 75 Buick and Olds front inlet carbs are 800 cfms.Chevy carbs are a mixed bag. The only real way to know is to look in the primary bore near the venturi look for the bulge. I like the 76&above quads because of the electric chokes ,apt, better castings and cheaper to buy than the earlier overpriced and sometimes restamped to get more money carbs.
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