And you left-out .... it will affect OP all the time.
I left out nothing. A crack that is submerged most of the time would only affect oil pressure when/if it is uncovered. But you know that.
Just so you understand my take on Flat's problem: I frequently deal with people who have thrown money at their problems until in frustration they have someone look for the cause. For all we know, Flat's pickup may be 1" off the bottom of the pan. A new, baffled pan and accompanying pickup that ends up where it belongs would fix his problem, no doubt. Hence my previous statement, "If everything is as it should be."
It is easy to get on an Internet forum and spend someone else's money. I prefer to know what is causing a problem before spending my customer's money to solve it. That's all.
