Nephew had ohio crankshafts build him a 572 bbc for a lake boat . It has 9.7 compression with dart alun 345 heads and roller cam. Initially the motor was dynoed by ohio at 720 hp on pump gas. When we got the motor it was leaking at the front of engine . We pulled engine back out of boat and intalled new front seal(in a cheap chrome timing cover) that came with engine and new pan gasket. Only after a few hours it is leaking again at around 4500-5000 rpms and slinging it out again. What in the hell do you think the problem is. I have built several engines over the years and never seen this problem. Steel pan. When we fixed it the first time, we still didnt know for sure where the oil was coming from. Now it has the same problem. What to do???????