The head gaskets that came in my kit KS 2110 were 8519PT1. With my block the bore was not all the way to the deck, there was a little bevel between the bore and the deck, I THINK it's called a chamfer, but when I lay the gasket on the deck the metal ring wouldn't seal properly if used. I was advised to use FPP-1009 or the marine head gaskets, the FPP-1009's worked. I don't know why now after looking at the bore sizes of the gaskets and mine are in my engine so I can't look.