Have to disagree on statement not use JB Weld in race conditions. One of my past cobras we discovered an
oil leak after installing the engine thinking it was the rear main. After taking the trans, clutch and flywheel out and inspecting the rear of the block it turned out that when the block was manufactured they must of mis threaded one of the
oil galley plug holes and then forced the plug in and cracked the block. Really didn't want to take it all out and redo the engine so we use JB Weld to seal it up. Raced the car numerious times and it never leaked again. That stuff is awesome and I would use it again.....