Black-Syde

iTrader: (7)

I got my oil pressure problems figured out thanks for all the input. The lifters were just dry as hell and just took about 15-30 minutes to get them re-primed. The truck sounds really strong. I can't wait to take it on a test drive.

99ssls1- i sent you a pm.

PewterZ28

iTrader: (1)

Updates?

Steve Bryant

iTrader: (1)

I have talked to 1999ssls1 on the phone and corresponded with him several times about this issue. This morning, he answered a PM that I had sent him yesterday and said that he changed the oil pump again to a Melling pump and now he has good oil pressure. Maybe he'll chime in again himself and fill in some details.

Steve

heavy6.0

iTrader: (69)

relief valve must have been stuck open. i have had this happen with ported ls6 pumps 3 times.

PewterZ28

iTrader: (1)

That's scary. I have a ported LS6 oil pump. Are you saying this can just happen out of the blue and totally ruin your motor?!?

Steve Bryant

iTrader: (1)

Although that might be a possibility in this case, we don't know the pressure relief valve/regulator is the issue. If the piston in the relief valve gets displaced (pushed down against the spring) and it sticks, the oil pressure would be low at low RPM's. Porting the pump (when done properly and properly cleaned) shouldn't have anything to do with the piston sticking.

My guess is more that he finally got a good seal on the oil pickup tube. We'll see what 1999ssls1 has to say.

Steve

1999ssls1

iTrader: (71)

Alright guys here is the conclusion. I tried 4 different oil pumps. 2 being your standard ls6, 1 ported ls6, and the last a Melling. The 3 ls6 pumps would not work on the engine, but the melling did and is what is in the car now. Im not blaming it on the pumps being bad. It could just be luck, but you may find out what Im fixing to tell you interesting. I tried all of those same pumps on another engine I built over the weekend and it was the same conclusion except for I also tried tried the stock one of that exact engine and it worked. By the way 2 of the ls6 oil pumps are new and 1 has about 500 miles on it.

srael505

k i too em having a no oil pressure problem with my 408. we had oil pressure at start up and a test drive. then shut it down for about 20 minutes. started the car again and had 0 oil pressure. what could be the problem any ideas? my guy called me and told me that gM sells a really good oil pump for 125.00 and that should fix the problem. im just not sure

Roller406Bu

iTrader: (1)

I'm having problems as well, car has 25psi at idle and wont go up any when i rev...

Steve Bryant

iTrader: (1)

Guys,
Just re-read and study this thread. It has most of the information that you'll need to understand how the oiling system works. There is no silver bullet in troubleshooting other than a knowledge of the system and thinking it through methodically.

Steve

LARRY01Z28

iTrader: (28)

Thanks For All The Great Info

camaroboy2000ss

iTrader: (1)

Hi sorry to bother but im having the same problem I changed my timing chain and oil pump front and rear seal and water pump and be for I had low presser now I have none at all I don’t know what to do I have tried everything that everyone has put up on this page its kind of crazy first I had no presser then I went to look at the filter and it was full so I gave it another go by turning the car on and off for 8 to 10 sec at a time I did that like 3 times and I got some presser than it when away and know I only get presser if I hold the rpm over 1500 I don’t know what to do does some one have something that might help