LS3Whipple

Hi Guys!

Thanks for any help. I heard about there is something to change (closing of ports?) on the LS3 block oil system, if an LS7 dry sump is mounted.

Regards

jordoza

Ls7 dry sump requires the long snout crank to run the second stage of the oil pump. So you need the crank, oil pump, front cover, pan, tank, lines etc. I thought about it at one point when I was building a stroker but once you get everything its almost as expensive as a real dry sump set up and it isnt as good as one because it only has one scavenge section in the pan. So all the oil still returns through the block eliminating the horsepower you save from the decreased windage and aeration of the oil in a true dry sump set up. Just my 2 cents.

LS3Whipple

Thx for your info!
I already have the LS7 dry sump mounted on my LS3 engine. So the most you write must have been installed.
But I heard that something has to be changed on the LS3 block, otherwise some parts do not get enough oil ??

What I figure out on blue prints is that both work on the same port of the block. So I do not see any difference. What about the way around the oil filter?

Twin_Turbo

iTrader: (9)

Nothing needs to be changed. Its a hydrib system much like the old barnes in pan setup for sbc. For a true external dry sump you need to plug the feed from the now missing crank mounted oil pump and either use a dedicated feed i to the gallery or the block rail. The ls7 srtup uses all block internaps like stock. The scavenge and pressure sections are seperated in the oil pan. That's what the stuff in there is for with additional hookups at the front scavemge section (hence different pan gasket)

LS3Whipple

Hi @Twin_Turbo

to realy understand that, with internal ls7 dry sump pump, there is nothing that needs to be changed inside the ls3 block !?
do you know any pics oder partlists that I could doublecheck that everything is correct and mounted inside?
is it possible to see the crank is the long nose one installed with demounted oil pan?

THX !!!

KCS

iTrader: (20)

You might need to plug the hole in the block for the dipstick tube.

LS3Whipple

of course

86_Z28kid

I'm currently doing this to my LS3. I just purchased an ls3 crank with extended snout. I've got the front cover and oil pump currently. However I'd like to see photos of this idea completed. I am trying to figure out the brackets and making sure everything lines up.