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I don't git it. Either the heat stays in or the heat comes out. I don't think we want it to stay in, do we?
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in a highly stressed race engine the wrap can retain too much heat, possibly cooking the valves. that almost never happens with a normally stressed engine ... much less an overbuilt engine like the rocket.
lots of custom builders and race tuners use the wrap. i've got it wrapped around my sprint's stainless steel headers, primarily to hide their sheer ugliness!