Quote Originally Posted by 383 chev
Denny I have to ask. Why the hardness. I understand why they hardend them i ground camshafts for years and ran them through welduction machines.
And i know that different manufactures have different rockwells. What does it mean to someone building an engine or or picking a camshaft?

Flat tappet cams have recently had a huge problem of lobes "going flat" during break-in. As I understand it, it's because of the manufacturers removal of zinc out of our motor oils for emmissions purpose.

I'd bet Denny tought is deeper hardening might be a preventative for this problem? Just a thought.