Most of the oil filter adapters I have seen have the "TOP" right over the oblong hole. However, I got one where the oblong hole is about 90 degrees from the "TOP"



What is the role/function of the oblong hole - oil from the pump to the filter or oil from the filter to the bearings, etc.



Does it make a difference where the oblong hole is located - must it be at the top?

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ