Found this thread on Ls1tech by Scoggin Dickey about oil pumps. I just got a new 12612289 pump for my 01 5.3 would it work well since trucks have a deeper pan and have more oil in one area. All the NNBS trucks use these pumps. What your opinion?

"Alright guys, we finally got a straight answer back from the engineers at GM on what exactly the difference is in these pumps!

We'll start off with the 12586665 OE pump that started in the GenIII motors and carried over into some GenIV. This is not the high flow pump. This pump has a thinner gear set and smaller diameter compared to the high flow pump. Also, this pressure relief valve cracks open at 32 psi.

Next the 12571885 pump. This oil pump began its life in 2005 on the W-body V8’s and the LH6 5.3L in the truck applications of the Trailblazer/SSR's. This is the high flow oil pump, but no longer in production. This was in production until July, 2006. This pump is very similar to the 12586665 pump, but has a thicker gerotor with larger OD and a stiffer relief valve spring that cracks open at 52 psi. There are some differences also in the pump housing but nothing major. It was replaced by the pump listed below, 12612289.

Finally, the 12612289. As stated above, this pump is the current high flow pump in production. It is identical to the 12571885 pump, but the relief valve isn't as stiff. This relief valve cracks open at 42 psi.

We spoke with the GM engineering team and they informed us that these high flow pumps should not be run on the LS2/3 engines with the stock pan, because they were starving the pan of oil. At first it may not make sense, but what was happening is the high flow pumps were pumping the oil out of the pan faster than it could return. So after a short period of time, the big pump had emptied the oil pan of oil. We were told the big pumps generally go on aluminum block applications with phaser and/or AFM (Active Fuel Management AKA: displacement on demand) hardware. The small pump goes on all iron block applications as well as the aluminum block applications without a phaser and/or AFM hardware.

In conclusion: These high-flow pumps are NOT for everybody. For those wanting to use them, it would be in your best interest to run an aftermarket oil cooler or remote mounted filter so that you have the extra oil capacity needed for this pump! Of course, Scoggin Dickey has options on both of those available for you as well! For the guys not looking for the added cost of such add-ons, we still offer our blueprinted and ported LS1 pumps for $149.95. They will give you the added oil pressure that most are looking for, without running the risk of sucking your pan dry."

 

good info...

 

pretty sure in that same thread on tech they say that the LS6 pump is the same as the 4.8/5.3/6.0 pumps except the LS6 pump has a different pressure relief spring.

 

I believe that the "LS6" pump is exactly the same as the 4.8/5.3/6.0 pump, but I'm not 100% sure.

 

Ya, but there not high flow pumps.

 

Just got done with the 12612289 oil pump and Voodoo 60510 cam. Oil pressure is about 69 at idle and above 80 after that. Running 7 qts of 5W30 oil. Hope it will not hurt anything because I'm not replacing the pump again.

 

i work at oreilly's and i looked up the part numbers just the other day for LS6 vettes and LS1 cars and 5.3 and 4.8 and 6.0 trucks and i had the same melling part number for all of them. i believe it was a M295 could be wrong though

 

That's 1 quart too much. The Gen III's take 6 quarts with filter.

 

Wouldn't more oil lessen the chances of starvation though?

 

I couldn't give you an exact answer, but more is generally not better. The more oil you got in there the more resistance to flow, may cause some sort of failure of the pump. I'm just boggled at how everyone thinks they need a "high flow" oil pump and LS2 timing chains and all this other BS. I suppose everyone just follows whatever some "guru" says like puppets.