350 LT1

I am rebuilding my LT1 and i have stock crack shaft and stock oil pan.

What type of oil pump do i get?

Do get melling pn# M55 or M155, High volume or standard volume?

Please i need to know.

z28boysteve

iTrader: (9)

high volume, always, the LT1 comes stock with a GMPP high volume pump anyway. dont forget to get the feed tube welded, and set the feed at the correct depth (about a 1/4" from the bottom of the pan) some doughy substance works good for measuring this.

dhdenney

iTrader: (53)

I thought with stock pans you are supposed to use std volume? I was under the impression a high volume will pump too much oil up top and leave your bottom end dry. Just what I thought. With the 6 and 7 qt pans you got extra oil for the bottom end and the high volume works well. If the stock LT1 had a HV I didn't know it.

97camarolt4

I use high volume and it works great.

monster7

iTrader: (1)

high volume pumps with stock pans are not the best idea. under hard driving you can drain the pain dry. unless you use a light weight oil

00Z-28-LT1

iTrader: (1)

i have the high volume high pressure in a 7 quart pan though, get the melling engin saver when you do this

96capricemgr

iTrader: (1)

The LT1s oiling system is pretty good, a high volume pump will just sap a little more power and as mentioned could suck the pan dry under sustained high rpm usage.

z28boysteve

iTrader: (9)

If you look up the stock LT1 pump gm refers to it as "high volume"

BigKap94z

iTrader: (47)

I don't think there is any need for a high volume pump with a stock oil pan. STD volume pumps are plenty, even for a built engine. Besides oil system capacity I believe another determining factor would be how the bearing clearances are set. I know a few engine builders that run almost all std volume pumps, and change the spring to raise oil pressure.