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Oil Pressure Regulator - old pontiac


cerino2000's Avatar
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07-21-03, 05:34 AM   #1  
cerino2000
Oil Pressure Regulator - old pontiac

Well it has been a while since I have rebuilt an engine and there are a few things that are coming back to me as I go through the process. This engine is a 72 Pontiac 455. I was cleaning up the oil filter housing and noticed this check valve looking thing on the inside of it. I pushed it down and it felt like it was all gummed up since I had to put some pressure on it to get it to move. I decided to take it apart to free it up a little and that is when I remembered that this is the oil pressure regulator. Now i don't know where it was set at before I messed with it. It was hard to move because I was bending it! Does anybody know if there is a measurement that you can set it at? Hate to take chances on a fresh motor.

Thanks

Rick

 
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07-21-03, 06:33 AM   #2  
Joe_F
This is something that a shop manual would detail. I would suggest you get one for this old Poncho.

I have one for my later ones, but they don't cover the 455 engine as it was not used in 1979, only the 400.

 
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07-21-03, 07:00 AM   #3  
cerino2000
Thanks for the reply. No luck with the on-line version of the manual although i appreciate the link. I will have to dig up and old manual or something.

Thanks

 
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07-21-03, 10:10 AM   #4  
Joe_F
Yea, too old for those. An old Mitchell, Motor or GM book is what you're looking for here.

If nothing else, an old Chilton at the library should have what you want.

 
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07-22-03, 09:19 AM   #5  
redneck
That 455 is junk--I'll take it off your hands! Seriously, what are you putting it in!?

 
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07-22-03, 09:31 AM   #6  
cerino2000
Redneck, that was a reallllll nice try. Believe it or not, I got this whole motor with a th400 behind it for $150. They came out of a 72 catalina in running condition. Problem i am having now is finding people that have the miscellaneous stuff i want for it. i guess in the 8 years since I put the last one together the parts have become real scarce. I am finding people in the most remote places are the ones that have the pontiac stash. And lots of it. Gotta drive to BF Egypt to get the stuff but eventually it turns up. I am going to go full roller valve train inthis one and expect to be at about 450hp. Having all of my machine work done now hoping to have it back this week. Found a set of heads in the backwoods about 1/2 hour from my house and hope to have those back from the port and polish shop in a few weeks as well. There ae a bunch of pontiac people that have stash piles of the stuff and want a fortune for it but when willing to look deep, I can usually get it at a pretty good price. Just a matter of finding it.

 
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07-22-03, 10:03 AM   #7  
knuckles
The oil pressure regulator is in the oil pump cover, not the filter housing. I *think* you're looking at the oil filter bypass valve. This valve opens in the event the filter clogs.

 
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07-22-03, 10:55 AM   #8  
cerino2000
knuckles, that is right. It is definately a by pass valve but it seemed to me that in the old school days you could adjust the oil pressure with it meaning that if a certain pressure was reached it would bleed off via that valve. I am worried about it being too loose and it opening at like 20 psi and never allowing the oild pressure to go up.

 
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07-23-03, 04:37 AM   #9  
redneck
Wow, 455 cores (if you can find them), are 600-800 dollars around here! 400's are still cheap. What are you putting the 455 into? the catalina?

 
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07-23-03, 05:01 AM   #10  
cerino2000
Not sure what I am going to put it in yet. I came across the motor and wasn't willing to let it go so I am going to get it done and then figure out what I am going to do with it. If I have my way, I want a 73 Trans Am but those are Realllll hard to come by. No hurry I guess.

 
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07-23-03, 06:40 AM   #11  
Joe_F
Just about any T/A body around here in the Northeast fetches a good buck (I own three Pontiac Trans Ams, two 80's and a 1979 10th Anniversary 400 4 speed), because of rust and abuse over the years.

My friend just paid 10k for a 400 10th and it needs some details! I paid 7,500 back in 1999 for mine and it needs details. These cars are going up in value.

Long live the Poncho V8 and 2nd gen Pontiac F car .

 
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07-24-03, 06:38 AM   #12  
redneck
Yep, the last four I sold went fast and I was asking a fair price--course I only buy 400, 4spd cars:
1979 10th sold in 2000 for $8,500
1977 formula, W-72, hurst t-top, 34,000 mile, 1 owner sold in 2002 for $9,000
1968 firebird convertible, sold two months ago for $12,500
1976 formula 20,000 mile sold last week for $8,000

All these were very nice rust free cars all 400 4spd. I regret all but the '76 it needed motor rebuilt. The rarest of all was the '77 should have tucked that one away! But greed won that battle--should have known--I bought it for $5,000 detailed it listed it for $8,000, they guy showed up the same night ready to pay full price--I told him I changed my mind and was going to keep it--he offered $9,000 cash and it went down the road! Found out later they only made a couple hundred of them!

 
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07-24-03, 07:16 AM   #13  
Joe_F
Lol. Always do your research before you sell . Any 400 4 speed is worth keeping!

 
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