I have MP cast aluminum valve covers with a PCV valve on the left, ran to the base of the carb. The RH valve cover has a chrome aftermarket breather on it.
I had a problem years ago with "PCV pullover". I made a baffle that virtually eliminates any chance of oil getting in unless the engine is upside down!
I'll add that when it used to knock, I never saw any blue/white smoke, only dark colored like unburned fuel.
I'll try to load pictures of the piston tops. There is some carbon buildup but thats all. I don't know what symptoms that detonation might leave behind. In 2011 when I pulled the engine to rering it, the rod and main bearings looked great even though I had some detonation in the past.
Regarding the idea of using the T H I N N E R head gaskets....Anyone care to sponsor me? If the engine runs fine, I'll pay you back !! :D
