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Uh, I have some experience with that. Perhaps I should Ebay the Appeal :D
FWIW, after SCCA rendered our cam, lash pads, small combustion chamber E88 head casting, trailer, beer cooler, and girlfriend's thong "OUT OF COMPLIANCE", we went back to a junkyard "A" cam in an E31 head and went 2 seconds a lap faster at Roebling Road the next race. Then won 10 of 10 the next year. Take that, Jim Creighton. &$%#@.
Point is there's not enough difference in any of them to move you on the grid, so don't fret and sleep well all you "A" cammers. :eclipsee_steering:
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Dang, I didn't know you fellows had all that trouble with them. I looked at the specs on the cams and the 8 degrees doesn't seem worth much at all. But it appears there is more to cam and year than simply the wisdom of a "C" cam is 260Z, and "A" cam is 240Z.