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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: BlueCollarRon on January 24, 2009, 03:38:37 pm

Title: Normal Oil Pressure?
Post by: BlueCollarRon on January 24, 2009, 03:38:37 pm

Whats up guys?  I would like to know, what is a normal reading for oil pressure?  I have a chev 350 (late 60's early 70's), I know it was rebuilt recently, but not sure how complete the rebuild was.  When I start my truck i have high oil pressure (70- 80) but once she starts idling nicely it stays from 35-40, when i hit the gas it jumps up 10-20 lbs.  Does this sound normal to you?  I plan to run this truck at high RPMs, so I would like to know if I am having any issues.  Thanks!

Title: Re: Normal Oil Pressure?
Post by: dumbucket1 on January 24, 2009, 04:09:33 pm

sounds nice and healthy to me

Title: Re: Normal Oil Pressure?
Post by: 78 Chevyrado on January 24, 2009, 04:22:37 pm

sounds good

Title: Re: Normal Oil Pressure?
Post by: VileZambonie on January 24, 2009, 05:50:34 pm

Someone probably put in a high volume oil pump but your pressures are good.

Title: Re: Normal Oil Pressure?
Post by: joesgarage71 on January 24, 2009, 06:03:22 pm

 Thats good pressure you have.
 10lbs for every 1000RPM.

Title: Re: Normal Oil Pressure?
Post by: friendlytruck on January 24, 2009, 08:58:31 pm

my truck runs at 40-60psi but there old oil gages from 1986 :-\

Title: Re: Normal Oil Pressure?
Post by: BlueCollarRon on January 24, 2009, 09:52:21 pm

Thanks for the reply guys.  If 10lbs per 1k rpm is normal, then shouldnt I only be reading 25 lbs at 2.5 rpms?   Or is it 10lbs per 1k  on top of the normal 40lbs?

Thanks fellas!

Title: Re: Normal Oil Pressure?
Post by: friendlytruck on January 25, 2009, 01:17:10 am

your welcome not much help though ps. my GM is a 350 V-8

Title: Re: Normal Oil Pressure?
Post by: Irish_Alley on January 25, 2009, 04:10:06 am

i know with mine she will run about 40-50 at first start up then once she warms up she drops to 15-20. just be happy your not at 5 when you warm up, thats "blue oval bad"

Title: Re: Normal Oil Pressure?
Post by: joesgarage71 on January 25, 2009, 09:21:31 am

 Just as a rule of thumb 10lbs for every 1000RPM