Quote:
Originally Posted by Ecky
I would include a waterjacket on your header to speed up warmup. Not too much area or you'll have to upgrade your radiator, but it'll probably help economy more than anything else you can do.
Also, as was mentioned before, take a look at Mazda's design. They were advertising that a carefully designed header was crucial in letting them use extremely high compression.
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I'd say you would need a "thermos bottle" coolant heat retention system in addition to that water jacket. It would have the reverse effect (cooling headers) until the coolant warmed up. Header Wrap would work all the time.