Oil pressure on a 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

'70GMCStep · 04-18-2011, 04:19 PM

My oil pressure guage is reading around 30-40 pounds of pressure at around 2000 rpm. If memory serves me, isn't it to be around 50 at same rpm?

I'm running a 350 chevy, 4bbl edlebrock, more of our vintage in heads.

Hoping the aftermarket gauge is not working on the blood pressure side after I disconnected it when painting.

Thanks guys,

'70GMCStep

'70 GMC Short Stepside

'65 Chevy LWB Fleet

1Bad62Pro/Street · 04-18-2011, 04:24 PM

Idling at 20 pounds of pressure.
Driving anywhere between 40-50 pounds of pressure depending on rpm range.

**PGSigns** · 04-18-2011, 08:35 PM

For a standard pump that is about right. Mine is close to that.
Jimmy

cableguy0 · 04-18-2011, 08:57 PM

Thats perfectly fine. Rule of thumb is 10 psi for every 1k rpm is acceptable.You have a healthy engine.

**jocko** · 04-18-2011, 10:07 PM

concur, 30-40 is ok at 2K rpm - you may be used to seeing higher pressure on newer engines - or newly rebuilt older engines, but if it aint broke, don't fix it, that's my motto. (but then again, I've grenaded two engines to the tune of an inopportune rebuild and a few $$.... Sooo, disregard everything I just said). (Just kidding, I DO think 30-40 is just fine at 2K)

'70GMCStep · 04-18-2011, 11:10 PM

I appreciate the advice guys. I'll relax now.

'70GMCStep

'70 GMC Stepside swb

'65 Chevy lwb fleet bbw

benoit454 · 04-18-2011, 11:49 PM

I always heard as long as you got like 14 or so on idle it's good and as long as it doesn't go to zero while driving etc.

I've had several though, all mech gauges aftermarket,

the 88 k1500 I got runs about 60 cold and stays that way, once warm and idle drops to around 30 or so.

the 86 k10 dad had was around the same, 20-40 warm on idle, 40-60 warm running and driving.

the 84 c10 305 he had runs 25 psi cold on idle, not sure on driving yet.

The motor he now has in his 84 c10 we built for another truck, it runs 50-75 warm on idle, 100-125 cold on idle and revving. it used to stay pegged at 125 cold revving, and would only drop to 100 once warm and idle. Now it's about 10 years old and it drops to around 50 or so once warm on idle. I think he put in a HP pump though, he kept saying it was a HV pump but it's a stock oil pan, I heard you need added quarts to run an HV pump or else you can suck the pan dry.

04-18-2011, 04:19 PM	#1
'70GMCStep Registered User Join Date: Jul 2007 Location: Rogersville, Missouri Posts: 89	Oil pressure on a 350 My oil pressure guage is reading around 30-40 pounds of pressure at around 2000 rpm. If memory serves me, isn't it to be around 50 at same rpm? I'm running a 350 chevy, 4bbl edlebrock, more of our vintage in heads. Hoping the aftermarket gauge is not working on the blood pressure side after I disconnected it when painting. Thanks guys, '70GMCStep '70 GMC Short Stepside '65 Chevy LWB Fleet Last edited by '70GMCStep; 04-19-2011 at 04:17 PM.

04-18-2011, 04:24 PM	#2
1Bad62Pro/Street "Where were you in '62?" Join Date: Jul 2004 Location: Cleveland County, North Cackalacky Posts: 5,013	Re: Oil pressure on a 350 Idling at 20 pounds of pressure. Driving anywhere between 40-50 pounds of pressure depending on rpm range. __________________ PROJECT: "FULL METAL YELLOW JACKET" 1962 Chevy C-10 Stepside Shortbed Nostalgia Pro/Street Pickup Truck PROJECT: "FULL METAL YELLOW JACKET Build Thread What Are You Workin' On? - 1Bad62ChevyPickup PROJECT: "TYRANNORAMBLER REX" 1969 AMC Rambler American Nostalgia Pro/Street Youtube Channel: Father Son Projects Youtube Channel: 2TIMOTHY2FITHTEEN "North and South Carolina Folks Click Here!" (((( ~ I have Parts For Sale & Miscellaneous Stuff ~ )))) "Well being as there's no other place around the place, I reckon this must be the place, I reckon...Nyuk Nyuk Nyuk" -Curly Howard Ph.D. Last edited by 1Bad62Pro/Street; 04-18-2011 at 04:26 PM.

04-18-2011, 08:35 PM	#3
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Oil pressure on a 350 For a standard pump that is about right. Mine is close to that. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

04-18-2011, 08:57 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: Oil pressure on a 350 Thats perfectly fine. Rule of thumb is 10 psi for every 1k rpm is acceptable.You have a healthy engine. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

04-18-2011, 10:07 PM	#5
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Oil pressure on a 350 concur, 30-40 is ok at 2K rpm - you may be used to seeing higher pressure on newer engines - or newly rebuilt older engines, but if it aint broke, don't fix it, that's my motto. (but then again, I've grenaded two engines to the tune of an inopportune rebuild and a few $$.... Sooo, disregard everything I just said). (Just kidding, I DO think 30-40 is just fine at 2K) Last edited by jocko; 04-18-2011 at 10:08 PM.

04-18-2011, 11:10 PM	#6
'70GMCStep Registered User Join Date: Jul 2007 Location: Rogersville, Missouri Posts: 89	Re: Oil pressure on a 350 I appreciate the advice guys. I'll relax now. '70GMCStep '70 GMC Stepside swb '65 Chevy lwb fleet bbw

04-18-2011, 11:49 PM	#7
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: Oil pressure on a 350 I always heard as long as you got like 14 or so on idle it's good and as long as it doesn't go to zero while driving etc. I've had several though, all mech gauges aftermarket, the 88 k1500 I got runs about 60 cold and stays that way, once warm and idle drops to around 30 or so. the 86 k10 dad had was around the same, 20-40 warm on idle, 40-60 warm running and driving. the 84 c10 305 he had runs 25 psi cold on idle, not sure on driving yet. The motor he now has in his 84 c10 we built for another truck, it runs 50-75 warm on idle, 100-125 cold on idle and revving. it used to stay pegged at 125 cold revving, and would only drop to 100 once warm and idle. Now it's about 10 years old and it drops to around 50 or so once warm on idle. I think he put in a HP pump though, he kept saying it was a HV pump but it's a stock oil pan, I heard you need added quarts to run an HV pump or else you can suck the pan dry. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454



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