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Message: <blockquote data-quote="Bert is my name" data-source="post: 1864543" data-attributes="member: 51833"><p>The main reason we got away from zinc and moly is catalytic converter contamination from burned oil. I do agree that an over dose of zinc and moly is not good. But in 20 years of building engines and repairing cars I have seen a lot of flat tappet camshafts fail due to wrong or improper lubrication. Typically if I am assembling an engine for a hot rod or performance application I go with what the cam manufacturer suggests.  I personally use Schaeffer lubricants almost exclusively.  In a race only application the debate between synthetic or conventional oils may not mean a whole lot if your program includes tear down between races. On long races thermal stability of the oil is probably the main concern. If it breaks down due to heat cycling then the ability to properly lubricate is lost.</p></blockquote><p></p>