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Ken B · 07-28-2016, 06:28 AM

My suggestion would be to first do a compression and leak down test. There is no sense in putting in a lumpy cam if you have an engine that might be marginal. Has the motor ever been rebuilt? If it hasn't then I'm gonna go out on a limb and say I'd leave it alone.... JMO..

07-28-2016, 06:28 AM	#4
Ken B Registered User Join Date: Sep 2015 Location: danbury, ct. Posts: 568	Re: Performance ideas stock 69 GMC 2500 396 My suggestion would be to first do a compression and leak down test. There is no sense in putting in a lumpy cam if you have an engine that might be marginal. Has the motor ever been rebuilt? If it hasn't then I'm gonna go out on a limb and say I'd leave it alone.... JMO..