So heres the situation, my buddy has an 01 5.3 in his 90 body silverado. A friend of his broke his oil pan. He then picked up the oil pan and pickup tube from an 07 silverdao. The new oil pan has like a pressure relief valve on it im assuming for dod. The windage tray had to be cut to clear the valve. After the new pan/pickup tube was installed the the truck now has a nasty top end tick. I told him he is having the oiling problem because the wrong parts were used and the windage tray now looks like a piston was shot through it, does this sound like it could be causing the oiling issues. The lifters were replaced today as well as the pickup tube o ring and the problem is still there. Can someone please shed some light? Thanks for any help.