USMC5811

iTrader: (2)

at idle with 5.5q of oil, at operating temperature, my pressure drops to around 30psi. is this too low? i have a 408 with a ported/polished LS6 oil pump and stock LS1 oil pan. any other info needed to see if this is about right?

ULTIMATEORANGESS

iTrader: (4)

what weight oil are you running?

USMC5811

iTrader: (2)

Mobil 1 5W-30

ULTIMATEORANGESS

iTrader: (4)

sorry i meant to reply earlier.

as a reference i have a freshly rebuilt ls2 and my pressure never gets below 40 at any point that ive noticed.

Endrance

I notice this once in a while with my car, a stock LS1, when I drive it around for a while and it gets hot. I'll notice my pressure drop below 40 (around 30-35psi). Imo seems normal, I run 10w-30 in my motor.

USMC5811

iTrader: (2)

hmmmmm wonder what it could be....only at idle and when its been driven for awhile...like at least 20-30 minutes

N20zuki

My 5.3 idles at 45psi cold, 25-30psi hot and still hits 75-80psi at WOT...

Jwilliams04

Your Pressure is fine. I run 30 psi at operating temps idle on my 408. As long as your pressure builds with RPMs your fine. GM Specs are close to 30 psi at idle.

Endrance

As the motor runs hotter the oil thins out so it makes sense if the pressure runs a bit lower at idle. The most important thing is that thw pressure goes as normal with your driving i.e. 60-80psi at WOT, 30-40ish psi with normal driving.

USMC5811

iTrader: (2)

ok good to know! cruising around im always right at 40 psi and WOT it increases accordingly. thanks guys!

man-o-war

As long as you increase with revs, you are fine. When revs dont have effect on pressure, you have to check things out...