i would imagine that Mike (MRL) put some decent stuff on there when he build the engine 4, 5 years ago
i sure do hope that will solve it
ill look into it tomorrow, wouldnt hurt to pull that bolt off and put some aviation permatax on it
bite the bullet now/cover/chain/pump/thermo clutch and use a anode in radiator drain plug and enjoy the summer and save your core plugs !!!
ask me how I know