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Doesn't all this depend on whether or not the tightest restriction in intake tract is the venturi? So, if the manifold runners or intake port on the head are only 38mm, for example, then isn't a 45 venturi too large for that? I wonder if the Ford X head in the video has at least 45mm I/D all the way through? So many questions . . . .So, the above video confirms, when using 40s, 32 to 33 mm chokes are about as good/big as you can
This tells me the Z World chart above has some validity and my efforts (moding 40s) are on the right trail.
In this test, optimized 40s made 144 HP and 140 ftLBs
Optimised 45s made 160 HP (+16) 152 lbs (+12) (with no loss vs 40s, above 2500 rpm).
So, Five Reviver, In light of the above, I think you should put in for a Name change.
More like Five REVer...?
BTW, Reviver/'REVer, did you match (increase) the intake size to the New 45s?