I have a rebuilt 57 235 and I'm getting alot of water built up on the inside of my aluminum valve cover. I tasted it and it tastes like coolant. My oil is not milky except on the inside of the valve cover. Compression is good in all cylinders, runs great, no temperature or oil pressure problems. Head had new seats, valves and valve guides installed and was supposed to be checked for cracks. I did not have this water problem before I rebuilt the engine. Any ideas on what the problem could be and what a fix could be?