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Old 08-29-2018, 01:44 PM   #48
Mike51Merc
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Join Date: May 2010
Location: Northeast Pennsylvania
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Default Re: 8BA Flathead overheating on highway

Have you checked your coolant for hydrocarbons? Or for pressure buildup?

The reason I ask is because a crack in the block can cause hot exhaust gasses to leak into the coolant passages causing hotter temps. This kind of leak will cause problems at cruising speeds and under loads.
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