I've been listening for years on how the driver side manifold on the big block A bodies was restrictive causing a major effect on HP. Well, my buddy who owns a flowbench decided to put the argument to rest with some old fashion testing. See the attached results.

Looks like the A body driver side manifold fared pretty well

DS AQ Body 383 manifold - @ .500" of lift it flowed 157.4 CFM

PS A Body 383 manifold - @.500" of lift flowed 164.2 CFM

C Body DS magnum manifold - @ .500" of lift flowed 161.2 CFM

The second chart depicts flow numbers from the most restrictive part of each manifold


Sorry about the pics. Couldn't figure how to attach a PDF file


CHART 1