Oil pressure line location - The 1947 - Present Chevrolet & GMC Truck Message Board Network

John Pasinski · 10-20-2009, 04:54 AM

I need to know if anyone has a 402, and where the oil pressure line is connected to the engine. Mine ('72) is connected at the left side on the engine just above the clutch bell crank. I've got (what I think) is really high pressure at the guage. It's almost pegged when driving, and close to that when idling. I can't find any blockages. I'm wondering if the line's connected to the engine in the wrong place and giving me an incorrect reading. Also; is there a way to check an oil pressure guage for accuracy? Thanks..............

Tx Firefighter · 10-20-2009, 06:19 AM

That's the correct spot for the pressure line. It sounds to me like you have a high volume oil pump in your engine. Probably added during a past rebuild.

Longhorn Man · 10-20-2009, 11:08 PM

assuming the guage is acurate (they were acurat-ISH 40 years ago) pegged is 60 pounds, straight up is 30 pounds.... you can probably fugure the math on the rest.
So pegged isn't all that high.

Mike Quillici · 10-20-2009, 11:54 PM

Good info, but where did you get the specs on the pressure gauge?

tim21391 · 10-21-2009, 12:36 AM

yes its on left side right by number 7 cylinder. real small line. and to your question about running high pressure.. im running a 402 and when im idiling i run the last mark on the gauge before high. and when i rev it or hit the gas a bit it goes up to high.. so you should be fine

Longhorn Man · 10-21-2009, 06:23 AM

it says so on the back of the guage, and the rest is simple math.
The big trucks have 80 pound guages in them.

Mike Quillici · 10-21-2009, 06:28 PM

Good deal. Thanks!

mclairmo · 10-21-2009, 07:18 PM

My rebuilt 396 reads 60 psi at about 3,000 rpm, but about 30 psi at idle. I believe it has a high volume pump. Can't remember, was built over 15 yrs ago.

John Pasinski · 10-23-2009, 04:31 AM

What a relief! Thank you ALL for your advice, & experiential knowledge.

10-20-2009, 04:54 AM	#1
John Pasinski Registered User Join Date: Aug 2007 Location: orlando Posts: 456	Oil pressure line location I need to know if anyone has a 402, and where the oil pressure line is connected to the engine. Mine ('72) is connected at the left side on the engine just above the clutch bell crank. I've got (what I think) is really high pressure at the guage. It's almost pegged when driving, and close to that when idling. I can't find any blockages. I'm wondering if the line's connected to the engine in the wrong place and giving me an incorrect reading. Also; is there a way to check an oil pressure guage for accuracy? Thanks.............. __________________ A man's thoughts devise his ways; but it's GOD that directs his steps.

10-20-2009, 06:19 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Oil pressure line location That's the correct spot for the pressure line. It sounds to me like you have a high volume oil pump in your engine. Probably added during a past rebuild. __________________ I'm on the Instagram- @Gearhead_Kevin

10-20-2009, 11:08 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Oil pressure line location assuming the guage is acurate (they were acurat-ISH 40 years ago) pegged is 60 pounds, straight up is 30 pounds.... you can probably fugure the math on the rest. So pegged isn't all that high.

10-20-2009, 11:54 PM	#4
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Re: Oil pressure line location Good info, but where did you get the specs on the pressure gauge? __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

10-21-2009, 12:36 AM	#5
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Oil pressure line location yes its on left side right by number 7 cylinder. real small line. and to your question about running high pressure.. im running a 402 and when im idiling i run the last mark on the gauge before high. and when i rev it or hit the gas a bit it goes up to high.. so you should be fine __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

10-21-2009, 06:23 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Oil pressure line location it says so on the back of the guage, and the rest is simple math. The big trucks have 80 pound guages in them.

10-21-2009, 06:28 PM	#7
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Re: Oil pressure line location Good deal. Thanks! __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

10-21-2009, 07:18 PM	#8
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: Oil pressure line location My rebuilt 396 reads 60 psi at about 3,000 rpm, but about 30 psi at idle. I believe it has a high volume pump. Can't remember, was built over 15 yrs ago.

10-23-2009, 04:31 AM	#9
John Pasinski Registered User Join Date: Aug 2007 Location: orlando Posts: 456	Re: Oil pressure line location What a relief! Thank you ALL for your advice, & experiential knowledge. __________________ A man's thoughts devise his ways; but it's GOD that directs his steps.

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