Quote:
Originally Posted by ford38v8
It wob;t go bad in the original packaging, and in fact, it may be better than anything you can buy today, due to the EPA reducing the zinc content in motor oil, which is needed in high performance engines. The only flatheads that need zinc are from the early 50's which had no hardened valve seats, however, most all of those engines have been rebuilt (or should have been) with hard seats.
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Hmm, there should never be any zinc on the valve seats! There's no way for it to get there unless you have the world's worst oil burner! Zinc additive is to prevent cam/lifter wear in an engine with extremely high valve spring pressures. Zinc is not needed in a flathead unless it's a high zoot all-out race engine.
I think you mean tetraethyl lead once added to gasoline to prevent valve seat erosion.