![]() ![]() About a year ago I read about the reduction of zinc dithiophosphate (ZDDP) in the oils supplied with API approval that could affect sliding and high pressure (EP) friction in our cars. My adjustment method works for me so well that on stock motors I just go ahead and glue the valve covers on before installation. But I also suspect the geometry is thrown off by the longer pushrods. The static adjustment method I use involves tightening till the up and down play is taken up(not quits spinning) then another half turn. It could possibly be wrong adjustment, especially if you depressed the plunger in the lifter too far. Scrutinize your parts and look for evidence of contact, this will help you analyze your problem. The other possibility would be that they didn't come with self aligning rockers and would have had a tight slot where the pushrods pass through the head casting, in which case those holes would need to be drilled out by the machine shop that installed the guide plates. ![]() The reason you gave for buying longer pushrods is foreign to me.Īnother point brought up already, Guide plates, If the heads were stock they might have come with self aligning rockers and round holes for clearance where the pushrod passes through the head casting. As the valve opens and closes the rocker arm goes through an arc causing the tip of the rocker to wipe across the valve tip, the average of this motion should be centered. Push rod length should be determined by the contact on the valve, by that I mean the contact area should be centered on the valve tip. ![]()
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December 2022
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