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ok I tried turning the rotor by hand, it doesn't turn.


well, if it had turned freely your issue might have been as simple as the oil pump drive or bearing. you're gonna have to pull the dizzy either way. get your #1 cylinder up to the top, pull the dizzy and check the oil pump drive. if all looks in order then it's your pump. the only other thing I can think of is the oil holes in the heads and gasket aren't lined up. and that, my friend, would suck! but it is the only change you made.......