Melling10295 Oil Pump, Wet Sump, Internal, Standard Volume, High Pressure, GM LS-Series, Each

Works great i recommend this over a stock because it offers better pressure. Haven't had an issue so far. And its made in USA.

I had a lifter fail on my 5.3 vortec 03 suburban. I pulled both heads, replaced all the lifters, springs and valve guid seals and put in a stage 2 cam. I had decent oil pressure before so I left the oil pump in place. I thought I dropped a bolt down the cam valley though so I pulled the oil pan and pick up tube. I reused the o ring on the pickup tube and that was a terrible idea. After everything was done I started the truck and had 40psi at idle but after the engine warmed up it would drop to less then 10 at warm idle.I decided to just order a new oil pump and because of the choppy idle I opted to up the oil pressure. This pump performs great! I used the installed spring, instiall the bolts hand tight and then spin engine 360 degrees to align the pump and then torque the bolts tight. I primed it by cranking the engine with the injectors unplugged on each valve cover. Once I plugged the injectors back in and started the truck it built pressure instantly. I attached 3 photos, one showing cold idle, one showing cruising and one showing warm idle. Oil pressure peaks just under 80 psi on hard throttle and never drops under 40 now. Very happy, hopefully I get another 240,000 miles out this engine now.

Nice

Oil pump work great keeps good oil pressure not had a problem with this fitting a 2008 Chevy Silverado .

Don't buy a cheap oil pump off of Amazon and then have to replace it almost immediately like I did. Get the melling pump, you won't regret it. The Chinese pump I bought it was hard to get the timing chain cover over it.

I run this pump on every Silverado/Sierra I work on that even remotely requires a pump/ timing cover removed. I alway use the max psi spring. One 6.0 I put one in with 270k well maintained miles holds 65 psi going down the highway all day long. One of my 5.3s that wasn’t so well maintained with 255k miles holds about 53 psi on the highway. My severally beaten and abused 5.3 holds 45 psi going down the highway. That’s just 3 ive done and I will always use this pump when I need to. Also I’ve never pulled the oil pan the pickup bolt does suck sometimes but not too bad

I installed this oil pump on my friend's 2009 Chevy truck with a 5.3 l.. I used the Spring that came already installed ..his pressure went up a bout 5 pounds per square inch. It is a true melling pump. Made in the USA. He has a Texas speed camshaft.. DOD delete. I would only use a higher pressure higher volume pump if you are staying with a VVT or DOD system. Other wise you are wasting horsepower. Imo.

5.3 gm engine. No oil pressure after installingMellings high pressure pump holds 75 lbs of pressure even after oil has warmed up.