We we're scheduled to race at Eagle Field July 31st, completely rebuilt 454, .030 over, big solid roller, about 600 horsepower,, anyway, my son had the engine built at a central california race shop. After installing the engine and doing the fine tuning, it develops this big ass oil leak, in the vicinity of the rear main. So we thot,,,,,, after further review we find the cam galley plugs in the rear of the block had been drilled and tapped and in so doing we're cracked. I attempted to outline cracks with red... Oil pours out of the cracks while we run the drill and pre-oiler at 65 psi. So I present this dilemma to the many master engine builders on the hamb. Anyone seen this before? I have not. and the million dollar question is... Can it be fixed or is the block junk.. This was a 2 bolt block converted to 4 bolt mains, not splayed, just a billet set of caps.