Blocking the heat crossover, IN the head.

RustyRatRod said

If you read up on gasoline engines, you'll see gasoline cannot burn unless it's in a vapor form. HEAT is a part of that process. That's the main reason for the exhaust passage, not "just" cold weather operation.

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Well, that begs the question as to why everyone recommends blocking the passage, and the aftermarket heads do not have that provision at all.

Ain't disagreeing with ya, but the conversation sometimes go in twelve different directions, lol.

Always room for edjamacation!

I always was under the impression a cooler charge was a denser charge.