I noticed after haveing my engine built a coulple years ago that I had an external head gasket leak I wasnt woried about it cause I never noticed any water in my oil so I figured it was only external and didnt care but today I took all the plugs out and turned the engine over to set my valves and I had antifreeze coming out of no. 1 there didnt appear to be any antifreeze in the oil I figured I would just put some block sealer in and keep an eye one the oil any recomendations? the headgaskets are cometic with 13.9 to 1 compresion I've heard of several people having them leak and claimed block sealer fixed the problem