Ok, you got me, the pump I got came from the shop doing my machine work and came without the pick up tube. I have a o ring coming from my local dealer. Sorry about the spark scatter comment, as that relates only to my experience with sbc. They drive the distributor and oil pump from the same shaft. If the stock pumps spec at 4 psi at idle, I see your point. I assume there is a thread somewhere giving the procedure for shimming the bypass valve. Could someone direct me to it? I will try a search now, but any help is much appreciated.