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Funny you say this. Some of the head bolts were loose where others were locked on solid. I cannot say there was considerable discoloration but again I do know that the water channels were not able to flow freely due to caked on crud. I did clean up the cylinder head on a piece of glass and got it to be clean all over uniformly. There is an ever so slight wobble to it that is not excessive that could indicate that the head is out of tolerance. The gasket should make up for it and I believe it to be good at this time. There are no cracks in the head or other imperfections that I could identify. The block also looks to be ok. I cannot understand why the part # has not been cross referenced to another set of rings. As you stated they made millions of these motors using the same pistons for decades. I guess it’s part of the fun searching what you need. Thanks for the input and for the part numbers. The 378432 part # is non-existant. I will try the other. Thanks.