Ok guys, here I am again..I posted not too long ago saying how I rebuilt my kohler magnum (92-93 model) anyway, i put new pistons, rings, cylinder hone, valve job, replaced bad valves, new gaskets..the whole thing. There is still a lot of oil getting blown past the rings somehow through the breather system and up into the air filter. There must be a reason for excessive positive crankcase pressure or something because the cylinder bore and rings are brand new and i had the guy at the shop make sure the cylinder was not oversized for a stock sized piston. Therefore, why am i getting excessive blowby and leakage out of the breather valve cover? I believe the breather is working correctly, not clogged either, and is installed correctly, is there anything else that can cause this? Could it be valve guides/seals? This motor has been torn apart three times already trying to fix the problem and I am ready to light a match! Any help would be greatly appreciated. Thank You.