Originally Posted by Riding Rich
The PK80 i have will need both head gaskets for clearence.
Without them the piston hits the head.
Have to mill the head to get the proper squish.
My base gasket blew out on one of my motors,so I pulled it and used hi temp silicone for the bottom gasket and the piston hit the head so I put 2 head gaskets on it and it fixed the problem....If I buy a slant head(being it is a dome shaped piston)I will put 2 head gaskets on it....