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Re: exhaust leak
Exaust flow rushing through down stream of the leak can suck in raw air. This air is like adding more fuel to a fire and creates more heat in the exhaust ports. This heat then is transferred through the head casting to the seats. Most cylinder head water jackets today are made bigger with more water capacity in order to take metal/weight out of the engine. This may or may not keep things cool enough.
But, who would want the noise and smell of a leaky exhaust and possible fire hazard from oil leaks and tight engine compartment.
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