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Originally Posted by lovehamr
I wouldn’t think that the difference here is so much OHV vs. OHC, the largest difference as far as flow requirements go is the displacement, 354 ci for the engine in question and 281 for the mod motor. That 73 cubes can make an enormous difference in camming requirements. Have you tried descktop dyno or anything like that to model other camshaft profiles?
Steve
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Actually the OHC has roller followers that allow a little better ramp rate than a pushrod roller cam. The 4 valve heads flow oh so much better. The little 281 flows more air than the 351W in factory form, even though valve size is limited by the tiny 3.54" bore.