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what purpose does that hole serve?

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It separates the hot exhuast crossover passage from areas where oil flows, oil in direct contact with ezcess heat causes the oil to cook and form hard deposits known as coke deposits...

Oh BTW lots of guys use a gasket designed to block the head to the intake... It greatly reduces the tendancy of the fuel to boil out of the carb fuel bowls... Newer fuels are designed for fuel injected vehicles & don't react well to excess heat without being pressurized like fuel injection does...

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