Engine Oil Pump

Exact fit on my 4.8 GM, Added 2 6mm washers to spring and it produces 45 PSI at ide after warm up and 64 PSI while driving. Way better than factory oil pumps. Will Recommend !

Used In a 370ci 500hp motor and worked perfectly. Kept oil pressure with ease. Will definitely order more when the time comes

Freshening up an engine and chose this one for quality and cost. I took the cover off and shimmed the pump gear with two feeler gauges to center it then tightened the pump bolts to torque spec. I lubed up the pump gears before replacing the pump cover then tightened the cover bolts to spec.

Works great melling for Ls engines

I was doing a cam,head swap on my 2000 Silverado 5.3. Motor has about 270,000 miles and while I was changing the cam and timing chain like the old saying since your there might as well change it!! The oe was still holding good pressure but would slowly loose a little around 30% oil life left on monitor (37psi idle 45 cruise speed). Holds 60 after warms up at cruise speeds and 42-45 at idle. Melling oil pumps have never let me down!!!Update 5/2/2019 5700 miles so far after install still holding great psi 42 hot idle 57-60psi cruise speed (50-70).Update 10/19/2020 I've put about 23,000 miles total on the pump since the install. Still holding great and the same psi as my last update (about 42 idle, 57-60 cruise speeds) no problems!!!Update 11/4/2022 I have around 45,000 miles over 300,000 miles on short block oil pressure still holding great,40-42 idle 60 at cruise speeds still no problems!!!!Update 12/20/2024 around 65,000+ and still holding strong!! Truck is my daily driver so it's getting used alot. If you ask me it's cheap insurance, coming up on 400,000 keep on rolling!!

Test fitted the pump. Removed it and found a metal shaving on the pick up tube. Found the outer ring to have the edge chamfer facing outward. OEM had the chamfer facing inward, thus allowing for corner clearance in the housing. Reinstalled it with the chamfer facing inward. Remember to shim the stator, outer ring with 0.002” fueler gauges before bolting on the housing. Plus prime the pump thru the side drain plug on the block, Melling has a video. The pick up tube did not slide into the housing hole, but used a screw driver to press the clip up and the tube slide into the hole. Chevy Avalanche, installed with the pan ON. 3d printed a custom wrench to install the pick up bolt, otherwise I could not have installed it without dropping the pan.

The oil pump worked perfectly to fix the ticking under the hood of my 2005 Chevy Avalanche Z71 4x4 LTZ Flex Fuel Truck.I was having a few symptoms, which everyone told me was a lifter knock. I was told that I would have to change the lifters and camshaft to get it to stop. The symptoms I was having are as follows:Ticking under the hoodOil pressure gauge fluctuation (down to zero when idling/cold and continually fluctuating while driving)I had changed the oil pressure sensor, so I knew it wasn't that. I started to do the work, but I didn't buy any parts until I checked for metal shavings in the oil pan and looked at the camshaft through the oil pan after removing the pan and plate underneath. I turned the engine manually so that I could see what the camshaft looked like. It looked smooth and glassy. There were no metal shavings in the oil pan, so I knew it could not be lifter knock. (Here you are looking for a significant amount of metal shavings, mine didn't have any).I decided instead to change the oil pump and o-ring. After a good week of work (including ordering and waiting for parts), the ticking was gone. The oil pump was the problem. The ticking is no longer there. My truck runs smoothly...actually better than when I first bought it. Since my truck had 150,000 miles on it, I also did a full moon trunion upgrade because Chevy put cheap half-moon trunions in the LS's, which tend to break and cause more damage in the engine. I also put new pushrods in. I went from 7.393 to 7.400 pushrods. These are upgrades though. Eventually, you may have to do the trunion upgrade if you want to keep your motor running and to keep from having to do costly repairs because the cheap ones break. Essentially though, if your truck is ticking and all you want is for it to stop, I would look at the symptoms above and if you don't see metal shavings anywhere, then the likelihood the ticking is coming from the oil pump. Change the oil pump and o-ring on the oil pump inlet tube and the ticking will go away.This oil pump saved my truck. Thank you :)

Great product works great. Oil pressure back to normal