Ok got the engine back from the machine shop then I had oil pressure issues. Upon removing the oil pump (ported/blueprinted TSP LS6 pump 8-10k miles) to install my new LS6 pump I get to looking closer at the block and there is a machined area with 2 threaded holes. Is there a plate that goes here that could cause an oil pressure issue and or any other issues?

 

why did you swap out a ported oil pump for a nonported pump?

 

I don't ever remember that part of my block having those threaded holes.

 

the ls1/6 genIII blocks were machined to have a timing chain dampener (GM part # 88958607) there, but werent put into production. it works very well to minimize chain activity/movement in high-RPM situations. some blocks dont have the holes drilled and tapped, but you can purchase the part and it comes with a template to help you install it on an undrilled block.

Well i couldnt find a picture of one, but SDPC carries them. Timing chain Dampener

 

Because it flows more volume and the '98 pumps are prone to failure.

 

Thanks ProjecT9. I later found this out aswell.

Swapped from ported to unported for the fact of NO oil psi cranking the motor over or fireing the engine.

Well now I still have no OIL PSI on the damn thing. Any other ways I can go with this. it has new sensor new pump.

Motor is fresh from the machine shop.
Hot tanked
Pressure cleaned
polished crank,
installed new cam bearings, main and rod bearings
checked for out of round with ARP rod bolts
assembled short block+cam and degreeing

 

did you put on the oil pickup tube O-ring?

 

yep and it is not pinched. I still have 3 more NIB pick up tube rings, and the one that came off this last time that has 0 miles on it and looks brand new

 

Things that can cause no oil pressure: trash in the oil pickup screen, out of oil, oil pressure sensor behind intake is broken or not plugged in.

 

pick up tube 100% clean as is screen. checked when I installed

I put oil in it before I checked for pressure

Sensor is new

Sensor is plugged in

Coupler is new


what about oil galley plugs? I know one of the local shops had issues on an LS2 with these.

 

What about the bumbell that goes in the rear of the block? It redirects oil or something. Machine shops are known to leave them out frequently.

 

ttt bumppp

 

I think 98fiveseven is refering to the dumbell and not the oil galley plugs b/c that would cause an external leak.

 

Good call on the dumbbell. You'd have to pull the rear cover to check that.

 

i know it flows more. he had a ported one on and now has a nonported one installed.

 

you pack, some greese/lube in the pump so it prime. Dry it dosn't prime itself

 

Stock for stock (non-ported or whatever). What’s the exact difference between the two oil pumps?

The only thing porting does is get rid of the rough casting at the opening where the pick up goes. No one does anything to the check valve bore. Porting only keeps the pump from ever having the check ball stick.


Is there a pressure difference?

To increase pressure they put a shim under the spring or maybe a new spring altogether.

Shimming the relief spring will only increase peak pressure and will do nothing below 65-70 psi. It will not allow more volume, which is what you need to keep the pressure up.

Defective Pumps Pre-2000

The pre 00s had a bad problem with the relief valve sticking open. It would stick because of poor machining in the value area.

Katech ports port the pump for better flow, but the oil pressure remains the same since they don't alter the pressure relief spring or shim the spring. They also clean up the bore that the pressure relief valve rides in so it won't stick and loose pressure.

If you install a Rollmaster double chain be sure to orient the required spacer that comes with the double chain properly to allow the oil to flow at full capacity. It can be installed upside down restricting the pump output. You didn't happen install a Double Row Timing Chain while you were swapping the oil pump did it? If so you may have put the pump output port spacer on upside down which is easy enough to do because it will fit on the WRONG WAY. This will severely limit the flow of oil out of the pump into the block. This would demonstrate as a low gauge reading not to mention reduced lubrication.

Missing plug on rear of engine with the blue o-ring. Its on passenger side if I remember correctly under the rear cover.

Part # 12558340 - plug, eng blk oil gal - 98-02

There's one in the front also, under the timing cover on the driver's side.

 

there is NO reading on my guage. Period.
The double roller shim is correct orrientation, checked and double checked.
I am going to talk with the machine shop after I get off work today to check our options. And pick up my old cam.

 

Shop said he is going to research some on his end and get back with me soon.

 

Let us know what you find. Hope you find the source.