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This subject is old news but the extent to which it has been applied isn't. As most of you probably know the new standards for oil call for a substantial reduction in the level of zinc (ZDDP) in oils because the zinc causes deterioration of cat's. For those of us with cars that have flat tappet...

I have never heard of these guys. Look at their crate engine prices. Not bad at all. http://www.precisionengine.com/rebuilt-engines/dodge-crate-engines/index.html