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GRX · 07-31-2017, 03:58 PM

Exactly as randy500 said above ^^
And if the heads have been degreased in an oven at too high a temperature it can relieve the press fit on the studs making them pull out easier.

Also ... if using Valvoline vr1 why add a bottle of zinc additive? More is not better. In fact, too much ZDDP can create a corrosive condition and is source of many cam/lifter failures.

07-31-2017, 03:58 PM	#8
GRX Registered User Join Date: Jul 2010 Location: MD Posts: 1,937	Re: symptoms of flattened cam? Exactly as randy500 said above ^^ And if the heads have been degreased in an oven at too high a temperature it can relieve the press fit on the studs making them pull out easier. Also ... if using Valvoline vr1 why add a bottle of zinc additive? More is not better. In fact, too much ZDDP can create a corrosive condition and is source of many cam/lifter failures. __________________ 1969 c-10 Step Side Long Bed. I-6 250cid = = 1969 Pontiac GTO hard top. 400, 4-speed.