Ilikeppie

iTrader: (5)

so im doin the h/c swap while im in there im puttin some headers on and im going to put a slp heavy duty oil pump in what oil should i use should i use a heavier oil beings its a heavy duty pump?

JPH

iTrader: (2)

5W30 synthetic oil. Royal Purple would be my first choice.

Ilikeppie

iTrader: (5)

Ilikeppie

iTrader: (5)

so this pump is made to run factory pressure or i can change the spring and it will increase 5psi under high rpm so should i leave it stock or more pressure i heard more pressure will decrease hp?

SOMbitch

iTrader: (8)

You'll never notice the hp loss, it is negligible. If you run 55-60lbs hot at 1600-2000 rpm I would leave it stock. If less prolly run the spring. Mine runs about 45hot so I am gonna run the high pressure spring on my Melling.

Ilikeppie

iTrader: (5)

i dont know what this new pump will run but my old pump was runnin about 45 hot at 2000rpm

SOMbitch

iTrader: (8)

You are about where I am then OP wise. I like better OP as my 99 Z-71 truck with 175k idles what my LS1 runs at 2k rpm (45 psi) but there are many vaiables. We are both well within the safe zone so I don't think too much about it though I wish my ls1 idled 45psi (70k miles on T/A vs. 175k on truck) and ran 55psi like my truck at 1500rpm but it doesn't matter, lots of variables. You (we) are both ok and well within healthy specs so just keep your oil changed and it will last a long time!!!!!!

Tainted

iTrader: (9)

run some of that nice german castrol 0-30

Ilikeppie

iTrader: (5)

im using the german mobil 1 0w40 plus i might gain some pressure with the new pump compared to the one that was in there with 75k on it

SSMOKIN_Y2KSS

iTrader: (5)

5w30 the oil pump really isnt gonna make a diffrence in your oil choice im still using 5w 30

vettenuts

iTrader: (4)

Correct me if I am wrong, but isn't the SLP HD oil pump their version of the Melling? If so, I would stay with the 5W-30 but if you have the optional blue shim remove the red shim and install the blue in its place. (This is assuming it is the Melling pump).

Ilikeppie

iTrader: (5)

yea it has the optional spring to make it a little higher pressure

vettenuts

iTrader: (4)

The Melling is the opposite, it comes with the higher pressure spring installed and you must install the stock pressure spring.

405HP_Z06

iTrader: (11)

The SLP pump is a Melling, modified to clear dual roller timing chains.