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**biketopia** · 01-12-2021, 05:12 PM

A 50 year old one, could separate any time. If it hasn't had oil leaking on it for the past 20 years I'd guess 350-400 for a stock one is a ok, as long as you're not spinning it to the moon regularly. My blue print 427SBC that dyno's 525+ came from BP with a $35 stock style damper...I run it down the strip so I went ahead and changed out to an ATI for the SFI rating incase tech at a track wants to bust balls.

01-12-2021, 05:12 PM	#4
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,008	Re: Harmonic balancer A 50 year old one, could separate any time. If it hasn't had oil leaking on it for the past 20 years I'd guess 350-400 for a stock one is a ok, as long as you're not spinning it to the moon regularly. My blue print 427SBC that dyno's 525+ came from BP with a $35 stock style damper...I run it down the strip so I went ahead and changed out to an ATI for the SFI rating incase tech at a track wants to bust balls. __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350