Quote:
Originally Posted by Formulajones
There was another test they did on a Ford that did a little better job of what you're referring to Mike. It was pretty much the same result though using a handful of AFR heads on that one. Started with 165's and went up to 195 and then either 220's or 235's. Torque was still excellent down low. The interesting part is that the 165's and 195's were almost identical throughout.
I think Steve Brule even did an episode on Engine Masters about this theory.
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Yes, I remember that one. Found it again: It was a 408 and they tested 165cc, 195cc, and 220cc AFRs. The 195cc produced the best peak torque AND peak hp (10+HP over the 220s). And on the 2500rpm start of the pull, the 195CCs matched the 165CCs for torque. Now, it was a mild camshaft so probably with more cam lift, might have seen an advantage on the 220CC for peak HP. Their results seem consistent with some of Vizards published results if you scale the runner size for displacement.