Engine Vibration 3k RPM

plumkrazee70 said

Ok, you're right. I know for sure I didn't provide.them with the flex plate or balancer, because I didn't have the balancer yet. So it wasn't balanced.

This weekend, I plan on checking the rotor phasing and pulling the plugs to see what they look like.

Click to expand...

If it wasn't balanced, and you used KB pistons, there is your problem. The KB pistons DEFINITELY effect the Bob weight, your only fix is to disassemble the engine and get it balanced. Running it out of balance like you are, can destroy the bearings also.