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03-30-2005, 01:32 PM
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#1 |
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Senior Moment
 
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,193
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Oil Pressure Gauge?
After putting in my big block my oil pressure gauge is pegged all the time.
My question is – What is the pressure rating on the stock gauge and is there a difference gauge for a big block? I want to keep the stock gauge and not have to hang an aftermarket somewhere. 
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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03-30-2005, 01:38 PM
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#2 |
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Resident Curmudgeon
 
Join Date: Dec 1999
Location: NH
Posts: 6,662
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Stock is 60psi, I think series 40-up had 80 psi.
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter  Maybe I need to sell some of this crap  Yet another Bozo with a sawz-all |
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03-30-2005, 01:56 PM
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#3 |
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Registered User
Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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My '72, 402 c-20 came with an 80 psi gauge.
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03-30-2005, 02:03 PM
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#4 |
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Senior Member
Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
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The bigger trucks had an 80 PSI gauge that is perfect for engines with a high volume pump.
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Saskatoon, Saskatchewan Canada |
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03-30-2005, 04:00 PM
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#5 |
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Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,193
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OK, soooo who has an 80psi gauge they want to sell me?
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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03-30-2005, 04:23 PM
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#6 |
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Senior Member
Join Date: Jan 2005
Location: Claremore, OK 74017
Posts: 2,639
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I had a similar problem. I put a rebuilt 305 in my 3/4 and the oil gauge stays pegged. And I don't want to do aftermarket under the dash either.
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68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4 |
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03-30-2005, 05:50 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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does havin it pegged bug you to the point of buying a new guage? As long as it is tached out...you know you have mega oil pressure...and all is fine.
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03-30-2005, 06:21 PM
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#8 |
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Registered User
Join Date: May 2000
Location: Frankfort, Kentucky, USA
Posts: 2,163
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my 400 sb does the same. It does bug me, i just want to see my real pressure. I was going to change to an electric aftermarket to go with my other guages, but if someone works out a factory replacement i'd like to see it.
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'69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks |
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03-30-2005, 06:39 PM
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#9 |
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Glowing since 1978
Join Date: Mar 2001
Location: Lusby,MD,USA
Posts: 532
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I may be wrong on this but I thought the GM oil pumps had a little pressure relief back to the suction when pressure was to high. That is the one that has the spring they tell you to remove if your welding the pickup in the pump so the spring doesn't relax and open all the time. Maybe I'm confused. Just remember pressure isn't the most important thing, flow of oil is. The bearing actually have pressure that is pretty hi in the oil wedge area. This is caused by the rotating crank trying to ride up the oil wedge. We don't measure pressure there on cars but at work we have some indications that show oil wedge pressure which is at least 2 times higher than any oil pump output pressure on the turbine.
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper |
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