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#1
08-28-2024, 06:09 PM
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Newbie to Pontiac
I have purchased my first pontiac a '70 Firebird w/455
Engine reportedly was gone through about 800 miles ago . I have low oil pressure 10psi or less at hot idle 30 psi at 3000 rpm I have changed the oil and tested it on a Snap On gauge same results ,no real answers from the seller.I was wondering what the chances are a galley plug came out. If I pull the timing cover and look if I have to pull the pan the motor is coming out, anyone know of a good machine shop in Houston or within a couple of hundred miles Thanks JWB |
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#2
08-28-2024, 06:34 PM
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If a galley plug cam out I do not think that the pump could hold 30 psi at 3K rpm.
My bet is the oil pump check ball is being kept unseated due to ingesting some crap . It’s time to pull the pan because even if the issue was due to a popped out galley plug you would want to inspect the bearings, or at least I would. The rod in cylinder #2 gets oiled last, so that’s the first bearing to put your eyes on.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
08-29-2024, 09:36 AM
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I will be pulling the motor more than likely
Check clearances hopefully just bearings and oil pump Get it tanked and cleaned Will probably yank the cam out and put a roller in it and one piece main seal A chance to do a upgrade The motor has eagle rods,kauffman heads 11-1cr |
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#4
09-09-2024, 06:03 PM
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Hopefully eventually the oil filter catches it
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#5
08-28-2024, 07:05 PM
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I use Jeff @ Westside Machine & Performance for my machine work.
I also sent you a message (upper right hand corner of the page).
__________________
'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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#6
08-29-2024, 08:36 AM
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Machine work
Quote:
__________________
37 Pontiac Sedan 455 700r4 94 Firehawk Supercharged 5.7 LT1 6spd. 71 GTO base 400 A/T 97 F250 7.3 turbo diesel |
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#7
08-28-2024, 07:54 PM
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Where are you pulling your pressure readings from? Are you certain your gauge is correct? What weight of oil are you using?
I'm not sure the oil pressure in my stockish 455 is THAT much better? Is there anything other than your gauge indicating a problem? Lifter clatter or other noises? |
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#8
08-28-2024, 07:57 PM
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No unusual noises
Gauge in the car and the snap on tester where the same 20/50 amsoil high zinc |
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#9
08-28-2024, 07:59 PM
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The old oil looked fine no glitter
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#10
08-29-2024, 10:19 AM
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Does not increase pressure after about 2200rpm
Pulling the pan I know is doable but not sure with this pan being a aftermarket one and not sure of tunnel and firewall clearance for a 700r4. Over 3000 I no longer have the 10psi per 1000 rpm Cold 3k is 68 psi Hot 3k is 28- 30 psi Idle cold 1k 20psi Idle hot 1k 10ish |
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#11
08-29-2024, 11:07 AM
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Quote:
Yeah those numbers would concern me too, probably easier to just pull the engine to inspect it further. Pulling the pan with engine in the car is doable but a huge messy headache & then if you do find a problem or want to do the changes you mentioned it needs to come out anyways. |
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#12
09-09-2024, 08:17 PM
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Will do on mag plug
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#13
08-28-2024, 08:01 PM
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One thing that bothered me is the dakota gauge is electric the snap on is mechanical
Got alot of fluttering on the mechanical (air maybe?) Last edited by 1qwerty; 08-28-2024 at 08:02 PM. Reason: Spelling |
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#14
08-28-2024, 08:10 PM
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I apologize for all the posts
One last thing the oil filter was maybe half full or less and I pulled it off about 5-10 minutes after shut down and noticed no bubbles Thanks again for the help |
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#15
08-28-2024, 08:57 PM
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I had a 455 that had about 6psi at hot idle and drove that car for thousands of miles and hundreds of 10 second 1/4 mile runs like that. You may not have a problem at all. 10 PSI per 1,000 RPM is good enough. No unusual noises and if the oil comes out clean I'd say drive it. Now if the oil pressure changes, drops, then I would worry
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Tim Corcoran |
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#16
08-29-2024, 12:02 AM
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So you have 30 psi at 3K, is that your max psi? What is it at 4k and 5k?
It sounds like you're saying it runs OK, and has no suspicious noises. So maybe before doing anything drastic, live with it, while monitoring closely and send in a oil sample for analysis.
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share Last edited by jhein; 08-29-2024 at 12:07 AM. |
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#17
08-29-2024, 05:19 AM
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The pulsing seen with a mechanical gauge is clear evidence of the pumps check ball being unseated or the pick up tube has come out of the pump body.
If you live with it as others have suggested ( of course it's not there money involved) then you will likely have to take the drastic action of having the car towed home and opening up your wallet for a expensive rebuild, that is if a Rod does not fail and blow out one side of your block.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#18
08-30-2024, 07:57 AM
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Wix was on it I replaced it with a k&n hp 2003
Made no difference The filter was half or less full when I removed it. |
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#19
08-30-2024, 08:05 AM
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Half full? That thing should start pouring out as you loosen it.
What kind of oil pan and how much oil are you putting in it? .
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#20
08-30-2024, 08:08 AM
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Drain the oil and look up in the oil pan with a flashlight, see if the pickup fell off the pump.
..
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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