LS Engine Conversion Info

Joshua8336 · Mar 19, 2012

johnmc said:
this is a great write up on the LS motor 550 hp. I think i am going with the l92 heads and cam spring combo
http://www.carcraft.com/techarticles/ccrp_0705_chevrolet_ls2_l92_cylinder_heads/index.html

ditched the puny 4.8, goin with 6.0. getting a fast 1022 intake and throttle body. bolting a t56 behind all of that. any ideas on what i can do for pedals, or know anyone who has a pair of stock pedals for sale?

Old77 · Mar 20, 2012

Nice job on moving away from the 4.8! If you're doing the LS swap do it right! :rocking:

asb2106 · Apr 17, 2012

foamypirate
got a question for you, does the wix filter assembly actually regulate the pressure down or is it the pump thats putting the pressure correctly?

My motor going in has a returnless rail as well..

foamypirate · Apr 18, 2012

asb2106 said:
foamypirate
got a question for you, does the wix filter assembly actually regulate the pressure down or is it the pump thats putting the pressure correctly?

My motor going in has a returnless rail as well..

Yep, the filter also acts as the regulator. It definitely makes it easy to plumb a fuel system for an LS motor. Just make sure you get the 33737

HotRodPC · Apr 18, 2012

That's some pretty smart thinking on whoever designed and built that filter. I'm sure it makes it a little expensive, but nonetheless a 2 in 1 part would sure make things easier, and 1 less device inline of the fuel system.

oopsman_09 · Apr 18, 2012

manbearpig where do you get that emblem in you avatar?

asb2106 · Apr 20, 2012

foamypirate said:
Yep, the filter also acts as the regulator. It definitely makes it easy to plumb a fuel system for an LS motor. Just make sure you get the 33737

Excellent thank you very much

I went with the Wix assembly, and got myself a new tank (25 gallon between frame model) and sending unit from rockauto.. the filter, tank and sending unit was only 179 shipped!

I bought a walbro 255 to go with it!

oopsman_09 · Apr 21, 2012

What about cruise control? Does everything hook right up? would be nice to retain that for highway driving.

HotRodPC · Apr 21, 2012

I'll go out on a limb and answer NO. The VSS will operate electronic cruise control just fine, but doubtful it will work with the older Vac diaphram pull type. The swtich in the column should be able to be adapted though I'd think. Just get the cruise control system off a GMT400 or later 89-91 Squares and rock with that.
Now if I told you wrong, I apoligize in advance, but that's the direction I'd be going in if it were me until told otherwise.

oopsman_09 · Apr 22, 2012

That actually makes sense.

foamypirate · Apr 22, 2012

HotRodPC said:
I'll go out on a limb and answer NO. The VSS will operate electronic cruise control just fine, but doubtful it will work with the older Vac diaphram pull type. The swtich in the column should be able to be adapted though I'd think. Just get the cruise control system off a GMT400 or later 89-91 Squares and rock with that.
Now if I told you wrong, I apoligize in advance, but that's the direction I'd be going in if it were me until told otherwise.

Depends if you have a cable throttle or a drive-by-wire LS. The drive-by-wire LS cruise control prior to 08' was a couple wires to hook up to the existing stalk, and boom, you had cruise. It's all controlled through the PCM and the electronic throttle. They changed that in the 08' and up truck motors though, I think they use a Body Control Module instead, or something.

If you give John at Speartech a call and let him know exactly what you have, you might be able to find out more. He is a very good source of info and is usually pretty willing to give out info even to non-customers.

oopsman_09 · Apr 22, 2012

Sweet thanks. Dont have the swap yet just gathering all the info i can before i get it.

Joshua8336 · Jun 20, 2012

dug up some wiring schematics from another site. i only saved the ones that could be used for the truck harness. i need the c100 schematics from 73-87 if anyone wants to come forward and post what they have feel free!
Fuel system, colors might not be correct.