Quote:
Originally Posted by Will N
The crankcase in the model a engine is very well vented with the large oil fill/crankcase vent tube. It should not be building up much back pressure in the crankcase that could cause a rear main leak- unless you might have put something like a mesh scouring pad in the oil fill cap to stop oil vapor blow-by from coating your engine compartment. But if you have excessive blow-by, then you likely have a piston ring problem. Like 1930-Pickup said, band-aid.
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Ford used a larger diameter oil fill tube on the model B engines to reduce crankcase pressure .