SStressin

iTrader: (5)

ok so i got my 383 built by lab machine.. started it up and had 5 lbs oil pressure.. switched pumps 4 times to different ones and nothing did the trick.. shimmed pan down with a extra gasket did nothing.. long story short it was the oil plug in the motor wasnt in so i boiught one and put it in.. went right up to 80lbs cold start.. the plug popped out bc it was the wrong size and ever since then i been having oil pressure problems..

i changed gauge, o ring and plug to the correct size.. ever since then i been having good oil pressure around 40-50 lbs cold start but on hot idle it goes as low as 16.. but wen i rev it to 2000 it jumps to 40.. it also doesnt go really past 40 when its hot. since i changed the plug it has been more responsive. but still on the hot idle it goes so low which i cant figure out..

should i put a oil cooler in it? or get another pump

the pump i have now is the ligenfelter gm high volume high pressure spring. oil is 10-30.

PREDATOR-Z

possible bearing damage

Paul Bell

iTrader: (9)

I agree, it sounds like the bearings have opened up a bit from when it was run with low oil pressure. Any noise or knocking?

Sounds like this LAB Machine shop should be doing some warranty repairs for you.

SStressin

iTrader: (5)

no nocking, ticking anything whatso ever sounds perfectly fine thats why i wasnt guessing bearings

SStressin

iTrader: (5)

going to go ahead and pull the pump out today and shim the spring then try and if not i have a ported ls1 pump.. going to try that then thicker oil if those dont work then im convinced its maybe a bearing or 2 thats why i dont hear any knocking or ticking... also going to see if there are any scratches behind or in the pump thats causing it to leak a little and maybe thats why its low at idle bc theres no pressure to pump it so it leaks thru scrathes etc..

SStressin

iTrader: (5)

just put the new pump and and 20-50 in and 60 cold idle 30 hot idle and jumps all the way to 60 when hot!!! finnaly solved this stupid problem!!!

SStressin

iTrader: (5)

also it turned out my old pump had a little scor in it.. so took a stock pump ported it put my high pressure spring in and thicker oil and it solved my problem!