Gasket/Oil pump question

[LTb1ow]

For a RMS, at work I have two options;
a) rubber for 22
b) PFTE for 25

They both are FelPros, and I assuming the PFTE is a different material? Which would you choose?

And then for oil pump, my choices are;
M55HV, M155, or M155HV...
First one is a 25% higher flow than stock, second is a 3/4 inlet standard flow, and third is a 25% greater flow, 3/4 inlet.

As of now, stock pan, so I am thinking my only choice is the M155 standard flow pump. Thoughts?

I also would like to get the pickup tube welded to the pump, good or bad?

Thanks.

[WildBillyT]

Skip the Melling M55 pumps. I am actually surprised you had not heard of the casting issues the M55 series of pumps are notorious for.

Melling Select pumps are OK, but I went with a Milodon.

[LTb1ow]

I actually just read about the casting issues last night, I will check out milodons tonight after class.

[WildBillyT]

I actually just read about the casting issues last night, I will check out milodons tonight after class.

Melling M55s used to come with a slip of paper that said "not for high performance use" or something like that.

Edit:

http://media.photobucket.com/image/melling%20pump%20warning/Brock_62/melling.jpg

[LTb1ow]

Yea, the select series is a better casting I believe and a high pressure spring with stock volume...

I had planned on seeing how much its all gonna run me on Summit tonight, so I will look into other pump options.

http://www.summitracing.com/parts/MIL-18756/

High pressure, standard volume, looks like a winner.

Edit: stock pick up is 3/4, back to searching..

[BigAls87Z28]

I have never liked the idea of using a HV pump witha stock pan. Remember that the pump will suck up more oil, faster, from a stock sump, possibly leaving the crank dry.
HV pump = 7qt pan IMO.

[KirkEvil]

Im not familiar with the LT1 oil pumps, but you can shim the relief valve spring to get higher pressure.

[LTb1ow]

Im not familiar with the LT1 oil pumps, but you can shim the relief valve spring to get higher pressure.

That seems like a horrid idea in practical terms... :rofl:

They make a spring for the high pressure relief, I think I am leaning towards that, or a Melling Select.

[Pampered-Z]

Seach the title OIL PUMP in this section. I detailed all the parts you need when running a stock pan.

[LTb1ow]

Definitley change it if you can.

I would add something better. LT1 have a bit low oil pressure. With a stock pan you want to stay away from the real DH/high volume units, don't want to risk sucking the pan dry, but there are units that are slightly better then stock that will give you a touch better oil pressure.


A) You can use a stock pump but install the GM white spring. This will give you a bit more pressure. * Note that although GM list it as 70 PSI, you most likely aren't going to see that high a pressure with the miles you have on the car.

Below is the into on the GM White spring:

Oil Pump Spring (3848911)
Oil Pressure in small-block and V6/90º Chevrolet engines is regulated by a spring in the oil pump cover. This spring (color-coded white) produces approximately 70 psi oil pressure. Small Image Technical Notes: Used in high-performance oil pump P/N 3848907. Minimum recommended oil pressure for off-highway use is 65 psi at engine operating speed.
GM LIST: $3.91
GM Parts Direct: $2.32 + S&H

B) Look into a Melling SELECT M155 pump (not the 155HV, that's too much for a stock pan ). they make two versions, the SELECT is an upgraded unit. Make sure you get the pump that matches your pickup tube size, 95/96 GM switched.



That is what I was leaning towards now, thanks!