It simply was not a apples to apples test in any way shape or form. Do not care what some customer thought. Just because he was "happy" does not mean anything to tell you the truth. What does he know really.
This is hot rodding 101 stuff. I learned this in 1980 when I was 15 and we were building a 307 for my brothers first rig (69 CK10 1/2 ton) Dad rebuilt the engine with a factory "Corvette" cam and a factory iron Q jet intake. Since my uncle worked at Carter he got us a 625 AFB. Never ran right until we figured out Q jets were not "Quadrajunk" as people called them. Put the Q jet on and it ran WAY better vs the Carter and adapter plate.
And since this test is EXACTLY in Cliffs wheelhouse I will take his word as gospel on the subject.He has spent far more time doing tests and "proving" them than anyone on here.
And I am not some "newbie" as I build my own Holley carbs from scratch and have done more than one back to back manifold/carb test at the track in my 69GTO drag car with the track as my dyno.
Unless that iron intake was modified to take a 4150( not easy but can be done,cast iron work sucks) or a different 2 plane intake with both bolt patterns the test just meant a 4150 primary JAMMED through a stock Q jet opening will not run as well as a intake with a original 4150 bolt pattern. REALLY, who would have thought that ?
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