Thread: carb sizing
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Old 12-19-2019, 08:16 PM   #7
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Join Date: Oct 2013
Location: Maine
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Re: carb sizing

Back when I used to read every hot rod magazine out there, they would do engine builds and calculate the cfm requirements. They would come up with those same low (theoretical) cfm numbers and then try a 600 carb for the first dyno runs. Then they would slap on the trusty Holly 750 and the dyno numbers would go up. I read the same story many times. In the end they seemed puzzled and theorized that "this particular engine just works better with the 750 carb". I'd say buy a 750 and forget it.

Then again we don't build engines just for the dyno. I still think a 600 carb is too small for a high performance 383. The 600 could be nice and peppy in every day driving and may be the hot ticket in a street truck. I guess it is a tough call.
76 Chevy K20
76 GMC K15
77 Chevy C10
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