We are using the new diamond coated lifters on it, so I feel pretty good about it. I have no idea what the junk was that was on the lobes. It wouldn't come off in my mineral spirits tank. The wire brush took most of it off pretty easy. I heat treat metal all the time, and I'm pretty sure that this wasn't scale from heat treating it.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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