T/ALT1

iTrader: (3)

Ok, putting together a twin Borgwarner S366 turbo 6.0 with Callies crank, rods and forged pistons combo. Have both stock 317 castings and stock LS3 castings. Will send off either set to be ported, good valves, springs retainers etc. Also have Holley Hi ram will be used for either head. Cam will be spec'd accordingly. Planning on running on pumpgas with meth on the street and E85 on anything over 15psi. Also have a Holley Dominator for fueling along with some 160# injectors and a powerglide for transmission to get the power transferred..

JoeNova

1000whp has been made on stock 317s with a stock LS1 intake and stock throttle body.

You could go literally any route you mentioned and hit 1000whp.

neverstop

i believe ls3 castings have thinner decks than other castings

oscs

iTrader: (19)

This.

oscs

iTrader: (19)

They are known to be thinner yes. With that said mine have seen over 28lbs and 20* pass after pass. It's all in the tune.

ls3fox

i didnt think ls3's were thinner l92's are but if you have both allready might as well put on the ls3's IMO

oscs

iTrader: (19)

L92's and LS3 are the exact same head just different valves

lilaaron233333

iTrader: (10)

I'd say if you have both run the LS3/L92s. Flow more and you'll have room to grow if you want to.

T/ALT1

iTrader: (3)

Ok this setup is for a car we are building at the shop. I like the LS3 heads also but have been seeing all these stock 317 head 6.0's running low 8's, Brian Tooley and LJMS swear Cathedrals make more power on boost. Just trying to get the most out of this setup. It's going into a 240 so it will fly either way.

oscs

iTrader: (19)

People will argue it to death. I went with L92 heads due to how cheap the LS3 intake was. They flow better than the cathedral port factory car intakes. As stated earlier you really can't go wrong either way. 317's are cheap. Maybe you can sell the LS3's and put that money back into the build.

Nitroused383

iTrader: (10)

Cathedral port for life lol.

2000WS6TA

iTrader: (5)

i have LS3s on mine. no problems here. Pushing about 600hp on 8lbs of boost. dont quite have the fuel to get it up to 1000hp yet. working on it though.

Nali6.2

put the ls3 on and sell my the high ram for the 317s lmao...

T/ALT1

iTrader: (3)

Ok we decided on going with the 317's for a few good reasons. The heads are actually L92's with the big heavy valves and both BTR and LJMS agreed the 317's would make more tq and HP under the curve which is what gets a drag car from A to B. Will put the L92's and Holley Hi-Ram for sale and looking for a stock set of nice 317 casting heads for this build. The 317's that were at the shop have since been used on another build.