Quote:
Originally Posted by rodneym
63/64 is a bit early early for a MR, no?
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Right, but what happened is that once the medium riser was made available, Ford used the smaller of the two basic "non-race" cams in it, which was the one that came in the 427-4v LR. You could specifically request the cam that came in the 427-8v LR in your medium riser, and that was done a good bit. Most people think that the cam that came in the 4v and 8v flavors of the 427 was the same, but it wasn't. If you look through some of the Cobra specs, and some of the stuff over on SAAC, you'll see a reference to the "K" cam, which was really the same as the 427-8v cam, but it would be teamed up with the MR manifold, and other stuff as well. The actual engineering and parts numbers were all very similar. Note, however, that there was one more cam that was above the "K" cam in performance. It had the exact same lobe configurations (duration and lift) as the K cam, but the LSA was much smaller. Nowadays, no one really cares anymore, but if they do, I'll post part numbers/etc. that I am 99.9% sure are accurate as to each of the flavors.