88 350 tpi formula

iTrader: (9)

well whats everyones take? I was looking at the slp ported ones or the melling high flow or higher psi ones

five7kid

iTrader: (14)

How about relative merits of the various offerings?

I'm thinking I'll change the pump on my LS1/4L60E swap. I've got the Melling M295 on my Summit wish list.

Klortho

Stock GM unit, probably the best to use.

1ADan

iTrader: (4)

a lot of guys seem to run ported ls6 pumps, but i too am staying stock. if i decide to stray from a stock engine setup, i'd probably go this route

Klortho

I don't know why someone would want a higher PSI pump, the stock one on my LS1 runs 40 psi idle, 40 psi at 1500 rpm at 75 mph and between 60 and 80 psi when cold or running the car up with 5w30 and 179k miles.

Pocket

iTrader: (24)

Port the LS6 for more flow. Shim the bypass spring for more pressure

88 350 tpi formula

iTrader: (9)

yeah i was leaning toward the ported ls6 pumps

BlueZee28

iTrader: (30)

Melling pump here. Works like a dream, zero oil pressure issues whatsoever.

Pocket

iTrader: (24)

Same... after I put it in

five7kid

iTrader: (14)

What oil pressures have you observed? What oil are you using? I believe you started with a rebuilt 6.0, correct?

BlueZee28

iTrader: (30)

I don't know exactly what PSI it is, my scan gauge doesn't read oil pressure, but on the dash gauge the needle points at about 2:00, maybe a little further to the right than that even. And yes it's a 100% new block inside.

BlueZee28

iTrader: (30)

Sorry I forgot to say what oil, I use Brad Penn oil, "The Green Oil" its a partial synthetic, like 15%.

five7kid

iTrader: (14)

What weight? Not that it helps a lot to know if you don't know what your oil pressure actually is.

The Melling is "standard" volume, I understand. Quite a bit less expensive than the "high volume" pumps I've seen. I haven't seen details, but I assume the Melling would at least be equal to a "ported" pump.

Pocket

iTrader: (24)

Port and shim the melling. Those operations arent LS6 specific

five7kid

iTrader: (14)

Wow, spend a hundred bucks, still need to work it over to make it worthy. . .

five7kid

iTrader: (14)

Maybe I'll just port and shim my own pump.

BlueZee28

iTrader: (30)

I didn't port or shim my pump, it's a race spec pump, I guess that means high volume, I'm not sure. The engine builder picked it out for me.

I want to say I was using 10w30 but the shop I get the oil from recommended something slightly thicker, so it might be 15w30.

Pocket

iTrader: (24)

No different than most cyl heads that arent CNC'd. Its 5 mins with a dremel and adding a small nut/washer under a spring. Not exactly a long drawn out process

If theres nothing wrong with it, this is a great option