Leak has stopped. Runs much better. Still has problem fouling number 4 plug and I fear a new head is the only cure. That plug tends to weld itself in and I believe it gets hot to the point just short of overheating back there although the gauge reads normal. I have no way of checking to see if the coolant flow is okay around the back end of the head without pulling the head. If I pull it, I want to replace it with a new casting no jet valve head but can't spend the bux just now.