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I'm thinking of rigging a movable "snorkel" (maybe the wrong term) that, in one position, pulls intake air from around the exhaust manifold, but then when warmed enough, can be moved away so it doesn't get too hot. Roughly similar to the cowl flaps on some airplanes. I'm thinking a metal tube extension that's hinged. The "heat" position would put the opening right next to the manifold, but the other position moves it a few inches away where it's just getting engine compartment air, not as severely heated by the exhaust.
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