Fred, its a good thing you put on that aluminum gear,a car engine will instantly blow up in a truck, spitting main bearing shims everywhere ; Standard model 283 and 327 engines have press on dampers.Used to rev them up pretty good , never saw too many dampers lying in the road. You have to consider the 40-50 year old damper on your inline engine engine.Is the rubber damping discs all hard and useless? Who knows? All those torsional vibes scurring up and down the long poorly supported crank , loosing up the maybe marginal pressfit on the damper. The retainer bolt ain't a bad idea.I have a genuine NOS damper on one of my trucks, and it is sure a tight fit on the crank snout.The other two dampers were rebuilt by the Damper Dudes or Damper Doc. But who knows if the rubber they use is tuned exactly as the original GM part.The Owner of the Damper Doc told me on the phone that good Stovebolt dampers are hard to find, most of them are broached oversize as a result of being removed several times.
