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Originally Posted by JFP in PA
This issue, by the by, is not limited to Porsche M96 engines, and is more common than you might imagine. Back when I raced, it was not uncommon to see some really creative "north west passage" external coolant plumbing systems on some domestic engines to get more coolant flow to problem areas. Might not look very pretty, but if it kept you in the race, it was worth it...................
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Yep. The Chevy 454 is world renowned for lousy cooling and engine hot spots. Lots of creative engineering is required to keep it cool when building the engine.