Had a similar situation. Turned out to be the cam (bent I assume, but I never measured anything). I had purchased a big hydraulic cam, had second thoughts about it and bought something smaller. The small cam was a PITA to get in the motor. And when it was in it wouldnt turn easily. Actually broke this cam removing it. And the big cam? It slid right in. Never had any issues once it was running. And it wasnt to big after all.
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