Model T engines leak oil. I've added seals to everything I can and here's my final trick to making these things oil tight. The corner where the hogshead meets the engine block and oil pan is particularly bad.
A shop vac hose is connected to the oil filler, a vacuum gauge is installed in the oil check port. All other openings are sealed up with aluminum tape and the vacuum is turned on. A hose in the ear is used to listen to all possible points of leakage. If there's a hiss, some MotoSeal, a very thin rtv used for motorcycle and snowmobile engine cases is applied to the leak until it stops. Once there's no more hiss and you see a rise in the vacuum gauge, you know everything is sealed up. I gained about 1 inch of mercury during the sealing process.
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