Quote:
Originally Posted by Tinker
Well isn't it normal that there is only one opening there for the electronic oil pressure gauge. People drilled and tapped it for oil filters (later yrs may have both). So maybe someone plumbed this in a wild way after removing the filter?
Certainly if that "to the sump" just drops oil into the pan or valley it would lower oil pressure.
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All flatheads have 2 - 1/4" pipe connections at the back of the block just as his picture shows.