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Old 11-19-2014, 07:59 PM   #11 (permalink)
Ecky
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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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