Vibrations / Shaking / low power

67Dart273 said
I say BS. An out of balance converter will indeed make an engine vibrate BUT NOT ALL THAT BADLY. I once ran a 360 with a 340 flywheel and other than NOTICABLE vibrations at SOME RPM it wasn't earth shuddering NOR DID IT cause real loss of power.

NOTE:!!!!

This was way WAY before Al Gore invented the internet

I did the same on a car that I was just moving around the yard. At idle you couldn't tell. At 2000 rpm you could feel it in the seat. at 3500 the entire car shook and rattled. That was a 360 and a 318 torque convertor so it was only the back end of the crank that was not counterweighted.