Thin vs Thick Discussion Chapter 1


$100 Site Donor 2021
Apr 28, 2008
Ontario, Canada
Is it a digital or analog oil pressure gauge? Lots of analog gauges aren't very accurate. What does the service manual say the oil pump pressure relief setting is?

50 PSI pump relief setting is the lowest I've ever heard of ... wouldn't say that's typical with the majority of engines. Most engines I've seen are more like 80 to 90 PSI to hit pump relief.
Looks like GM does some weird crap:

Screen Shot 2022-05-21 at 11.00.45 AM.jpg

Backed-up by this article:

  • High pressure performance upgrade for M295
  • Stock volume (factory volumetric flow rate, around 6.8 GPM), 10% increase in pressure over M295 oil pump
  • 33 PSI Pressure Relief Valve Spring
  • 0.96 Displ (cuin/rev)