Re: Foaming coolant under heavy load, bad head gasket?
I had a very small crack in a head that would not leak until the engine warmed up and the crack expanded. I think that sounds like what is happening with your engine. The solution was to replace the head. One of our great engine rebuilders who posts here “gave” me a stock head, charging me only a very reasonable price for bead blasting, magnafluxing, and decking the head.
W. Michael
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