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garyd1961 · 05-21-2017, 05:41 PM

Make sure the bolt in the balancer is tight. I had a 383 I bought that vibrated at 3000 rpm and the bolt that holds the balancer on was missing. It was just pressed on and had worked loose, chewed the crank up.
Also make sure you have the right balancer and flex plate for the motor.

05-21-2017, 05:41 PM	#4
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: Sbc vibration at 3000 rpm Make sure the bolt in the balancer is tight. I had a 383 I bought that vibrated at 3000 rpm and the bolt that holds the balancer on was missing. It was just pressed on and had worked loose, chewed the crank up. Also make sure you have the right balancer and flex plate for the motor.