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Originally Posted by Alan Roehrich
Jeff, that is indeed correct. The problem is that they work well for a small block Chevy, and some other engines, but they don't work well on most big block Chevy valve covers.
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They do work on stamped steel valve covers on the bottom and that's where most of leakage problems occur. The best stock stamped valve covers came on marine engines; heavier guage and precision fit. They do not warp, clear most rocker arms including T&D, Jesel. They's just not glamorous enough for the up to the fence people.