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flatjack9 · 05-23-2021, 07:23 PM

If I run anti-freeze in my engine, it does exactly what yours does. Seems like anything over 2500 rpm and I get foaming. Running straight water I have absolutely no problem. My 39 has an open radiator - no pressure cap.

05-23-2021, 07:23 PM	#12
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,543	Re: Possible blown head gasket? If I run anti-freeze in my engine, it does exactly what yours does. Seems like anything over 2500 rpm and I get foaming. Running straight water I have absolutely no problem. My 39 has an open radiator - no pressure cap.