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Originally Posted by DEI37
You'll burn exhaust valves that way, not bend them. I would imagine that it is a cool factor for real quick more than anything. And it is!
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no, you'll bend 'em. You get 'em warm, and then you shut the motor off, and the cool air hits 'em, and they warp.
that's why you see the dragster guys stuffing rags in the header pipes after they shut the motor off. To keep the cool air from getting in there.