Just don't try it with Jet-Hot coated headers. We received nothing in the literature provided not to break in an engine. A break in of a basic street small block curled up the coating everywhere. When talking to Jet-Hot, they acknowledged that it was okay to break in an engine like this one. Their form of customer service was "offering" to have me mail the headers back for over $100 bucks AND having me pay for new coating. I had heard great things about them until that personal experience.