Mad Scientist Testing Carter AVS 4966S (short video)

Neither did BG flow their H clones at 1.5" of Hg like Holley did. I have no idea what Carter flowed their carbs at, but when you look at comparable throttle bore/venturi sizes of other brands, the flow #s are close, if not the same.


As far as Carters not matching cfm claims: the 750 Holley has 1 3/8" pri & sec venturiis, and 1 11/16" pri & sec bores. A 750 Carter AFB has the same bore sizes but considerably larger venturiis: 1 7/16" pri, 1 9/16" sec. The AFB does have a velocity valve in the secs that might have a small impact on flow.
Maybe you need to re-calibrate your bench.

The secondaries of a carter AVS are relatively unobstructed compared to AFBs. AFBs have a venturi that reduces flow & a bulbous booster that reduces flow; the AVS has none of that, straight bores & a brass 1/4" tube sticking out of the bore.

Edel may have 'selected' 600 cfm to compete with the popular H brand. Why don't you ask them?