bones427
Well-Known Member
- Joined
- Jan 24, 2010
- Messages
- 103
- Reaction score
- 5
I just redone my 340 . and had great oil pressure 80 +lbs. new hv melling pump and deep pan. drove it a few times its ok . went for a cruise and its all over the place from 0 to 30 get it home change oil from break in stuff . now only have 40 to 45 lbs and when you raise rpms pressure goes down. checked with diff.oil gauge, same. check pump drive its good, pulled pan and checked pump every thing looks like new. valve moves free in pump. pulled rear cap to check the plug above its ok and bearings still good and pan is clean so no spun bearings. any ideas?