Another BBC Motor??? Dampers

[Marv D]

Because all cranks have a 'slight' variation. I have a ATI superdamper that was honed and fit to a Cola crank. I have a Eagle sbc crank that you can push 'that' balancer on by hand,,, literally BY HAND! ATI leaves them tight so they can be honed to the exact press fit for THAT crank. (off the top of my head) they want a 0.0002 to 0.0007 press fit to properly absorb harmonics from the crank. Too tight and you can't get it on the snout, too loose and it doesn't do it's job,,, absorb harmonics. And No, not all aftermarket dampers need to be honed to fit,,, just the good ones.

In all honesty, if you have a GM crank you will probably be just fine having it honed to /normal/ GM crank size. But if you have some imported POS crank final machined anywhere else other than the US,, it's a crap shoot. If you have a 'good' mic and know how to use it, you can just tell your machinist what the diameter is, and what the press-fit needs to be (will be in the instructions with the damper)