Oil Pressure - new motor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

truckintexas · 03-23-2009, 12:19 PM

Fresh rebuild, 0 miles. ran about 1 hr at fast idle. 1967 327 ci, over .030, Double hump heads, Melling High Volume Oil Pump, stock filter/pan.

Is 70 lbs oil pressure too much? Do I have a problem?

Hottrucks · 03-23-2009, 12:31 PM

what weight oil and did it stay there even when it was warmed up ?? also did you pull the valve cover to see...I also suggest a mechanical guage for new motors unless you are positive the electric one is accurate

truckintexas · 03-23-2009, 12:42 PM

10w40, 70 degree day in TX. It dropped a little after warm, but never went below 65 lbs.

Hottrucks · 03-23-2009, 12:57 PM

I would expect around 45 but at a high idle ( sounds like your breaking in the cam) that should be about right........

69halfton · 03-23-2009, 01:46 PM

my 383 sees 90 psi when cold (but then its Canada, so its pretty cold even in summertime)

but usually settles to about 50 psi while driving, and maybe 20 at idle.

i'd keep driving it, if its not knocking or burning oil.. i usually look at high oil pressure as a good thing.

monte0185 · 03-23-2009, 02:06 PM

I would pay attention to how the engine sounds. A brand new motor with real close tolerances can run some high pressure and its not a problem but much more higher and youll wash out the bearings. There is such a thing as too much lubrication.

jamesi20 · 03-23-2009, 04:36 PM

I think the high volume oil pump is keeping it up there also.

truckintexas · 03-23-2009, 05:13 PM

Thanks folks.............I'm, gonna keep an eye on it..........Haven't got it on the road yet, but plan on running it again fast idle tonight or tomorrow. I've had em stay up around 50 before, just not 65-70.

03-23-2009, 12:19 PM	#1
truckintexas Registered User Join Date: Jul 2004 Location: Weatherford, TX Posts: 225	Oil Pressure - new motor Fresh rebuild, 0 miles. ran about 1 hr at fast idle. 1967 327 ci, over .030, Double hump heads, Melling High Volume Oil Pump, stock filter/pan. Is 70 lbs oil pressure too much? Do I have a problem?

03-23-2009, 12:31 PM	#2
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Oil Pressure - new motor what weight oil and did it stay there even when it was warmed up ?? also did you pull the valve cover to see...I also suggest a mechanical guage for new motors unless you are positive the electric one is accurate __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

03-23-2009, 12:42 PM	#3
truckintexas Registered User Join Date: Jul 2004 Location: Weatherford, TX Posts: 225	Re: Oil Pressure - new motor 10w40, 70 degree day in TX. It dropped a little after warm, but never went below 65 lbs.

03-23-2009, 12:57 PM	#4
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Oil Pressure - new motor I would expect around 45 but at a high idle ( sounds like your breaking in the cam) that should be about right........ __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

03-23-2009, 01:46 PM	#5
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	Re: Oil Pressure - new motor my 383 sees 90 psi when cold (but then its Canada, so its pretty cold even in summertime) but usually settles to about 50 psi while driving, and maybe 20 at idle. i'd keep driving it, if its not knocking or burning oil.. i usually look at high oil pressure as a good thing. __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. Last edited by 69halfton; 03-23-2009 at 01:47 PM.

03-23-2009, 02:06 PM	#6
monte0185 Registered User Join Date: Oct 2008 Location: Brighton, TN Posts: 1,267	Re: Oil Pressure - new motor I would pay attention to how the engine sounds. A brand new motor with real close tolerances can run some high pressure and its not a problem but much more higher and youll wash out the bearings. There is such a thing as too much lubrication. __________________ A computer once beat me at chess, but it was no match for me at kick boxing. Duct tape is like the force. It has a light side, a dark side, and it holds the world together.

03-23-2009, 04:36 PM	#7
jamesi20 Senior Member Join Date: May 2002 Location: NORTHEAST OHIO Posts: 494	Re: Oil Pressure - new motor I think the high volume oil pump is keeping it up there also.

03-23-2009, 05:13 PM	#8
truckintexas Registered User Join Date: Jul 2004 Location: Weatherford, TX Posts: 225	Re: Oil Pressure - new motor Thanks folks.............I'm, gonna keep an eye on it..........Haven't got it on the road yet, but plan on running it again fast idle tonight or tomorrow. I've had em stay up around 50 before, just not 65-70.



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