Tht's why I asked the question.I'm aware of the harmonics and the twisting and untwisting of a long crankshaft.Any stock damper is at least 40 plus years old and the rubber "dampening" is likely gone away.I have sent dampers to be rebuilt,what are the odds of the correct rubber being put back in so the damper is tuned correctly?
I have a nice looking 270 GMC damper sitting here,that might be fine on a 261 Chevy,or not.

Last edited by Tony P; 10/27/10 04:22 PM.

70 Triumph 650 cc ECTA current record holder