A while back I helped a guy that said he had a 068 copy. But when I asked, I found out he was using comp cams XE profiles that had about the same .050” durations as a stock 068. He duplicated the ICL and LSA of an 068, but with XE profiles on both the intake and exhaust. It ran ok, but it would not have out ran an original 068 that had less a lot less lift. I think his XE cam made it about 40,000 miles before he lost the cam and beat the valve guide to the point it was using a lot of oil. It appeared to have a lot of reversion issues at high RPM’s, the power just abruptly nosed over when he put it on a wheel dyno.
With cams, the term copy can be a pretty vague term.
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