Engine Vibration 3k RPM

T56MaxTorq said

Yeah man try and find out what’s wrong before having to pull it out. It really sucks to have an engine in the shop for a problem but there isn’t a smoking gun during tear down.

this is what makes this unique and interesting - it was .030 over when you got it to freshen up. Then it was fucked so you bored it out. Did the previous guy balance his rotating assembly? And is it in your favor or does it actually make the vibration worse!?

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You make a good point that I hadn't thought about. He had TRW pistons, that I sold but I re used his crank and rods because they were in useable shape. I didn't know the history of the motor, I just bought it on CL intending on rebuilding anyway. It was only $300 for a complete 340, so I couldn't go wrong. I just wish the machine shop would have said something about the balance. They had all the original crap there, thats how we found out about the pistons being un usable for the block bore.