Originally Posted by skipjobe
Forged 383 LT1
Got the engine in, working on tuning, on full throttle pull loosing oil pressure. test in neutral with engine warm. 1000 40 psi 2000 40 + 3000 40+ 4000 psi drops like a rock, back to idle, pressure comes right back up.wix filter sae 30 motor oil 6 quarts. [over filled]
Changed to a cheap purilator filter new 10w30 oil 6 quarts 1000 ok 2000 ok 3000 ok 4000 ok. in neutral. road test good to 5000 drops like rock between 5000 and 6000. checked for missing oil pick up it is in place about 1/2 inch off bottom of pan viewed through drain hole it is not loose and it was welded. Stock pan, Melling 55A pump.
I am stumped, I feel like the pump in going dry or sucking air, it is a real pain to pull the pan at this point so I want to exhaust all other options before I start pulling it apart, and at this point I don't know what I am looking for. The engine was built by a local dirt track engine builder he is also stumped.
You could be pumping your oil up to the valve covers. Did you put oil restrictors in your block. These will restrict oil to the lifters which will keep you from pumping all your oil up top. I once installed a roller cam in a 351 clev. and it would pump the pan dry inless than 2 minutes. I ended up installing a Jack Rouse restrictor kit in the main journals of the block to fix. I think that maybe your problem. Let me know what you find.