I am having the engine rebuilt in my 1929 Pontiac by the local machine shop. Everything has went pretty smoothly except they have an oil leak they are not for sure on how to fix. They have the engine running and probably have about 2 hours run time on it so far. There is an oil leak between the rear of the crank and the block. There originally is no gasket there. They say it is made to drain the oil from that area back down into the pan. We assume they always have leaked some because of the design but they are not comfortable letting it leave because of the size of the leak. Concerns with getting oil on the clutch etc. Does anyone have any suggestions on a fix?? Thank You for your help!