had a head gasket that was diagnosed as leaking on a 77 f2. brought it home after new gasket and it had an oil leak. took it back and they redid it. took it out and it had several oil leaks. brought it back again and they diagnosed it as a pressure relief line being plugged. they felt that that was the problem both times the oil leaked. they unplugged the line, went out and when they brought it back it wasn't leaking as badly. thereby asserting that that's what caused the leak both times. comments please.....