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Old 07-16-2016, 11:44 AM   #20 (permalink)
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Residual sand has become suspect over the years. OTOH Motor City Flathead suggests unpressurised cooling systems and high compression heads with poor sealing as additional causes.

Motor City Speed Equipment, Dundee Michigan, Overheating

They also offer a new, re-engineered flathead block in 289 to 339cu in.

Motor City Speed Equipment, Dundee Michigan, Newly Engineered Flathead Block
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