Ls6

Got myself an LS6 out of a CTS-V that dropped a valve, didn't even touch the sleeve! Destroyed the one head and #8 piston though obviously. The valve hit sideways dead center in the piston! I have LQ9 heads and an LS6 intake for it. Still need all the accessories to go along with it, knock sensors, etc. Gonna tear the whole thing down and measure the crank and cylinders and throw some new pistons and bearings in it. I'm trying to decide on a camshaft, I'm leaning towards the 222/224 .556 .568 112LSA from Comp. I want a nice lopey idle along with the extra power to go along with it. I have the 5 speed manual right now, and don't plan on driving the snot out of it constantly, but still with that kind of power I don't expect the NVG 3500 to last a long time (especially having nearly 250,000km from the lil 4.3:D), a T56 will replace it. (NO way I'm going auto).

Anyways this will be a gradual build as funds come and parts come, no big rush. I want to have all the parts necessary before I do the swap. Any advice would be appreciated!

I'll have the engine here by the end of next week, I'll post up some pics when it arrives. :D

sweet, sounds like its going to be a fun project...:hyper2:

dang that does sound like fun

from what i hear on t-56 swaps, you're better off going with the LS7 clutch, especially if you're building the motor. also you'll wanna do the drill mod, if you ain't already, or you'll have that same 2-3 crap shift when you're getting on it

good luck on the swap! sounds like a fun truck to have!

Thanks for the input guys, I appreciate it! I'm really green when it comes to modifying stuff, what interchanges, what parts to use and what not to use etc. I am a licenced mechanic and work at a GM dealer but when it comes to modifications you never see that up here (except for little honda piss pots with the fart can exhaust and 3 foot wing on the trunk) :lol: You see the odd truck with a cat back exhaust or a lift on it but that's about it!

Questions! What PCM and harness should I use? I'd like to get one from the wrecking yard since that'd be the cheapest route. Should I get one out of a Z06 or CTS-V that has the LS6/6 speed or would I be better to just get a truck harness, I know they're close to the same. Nelson Performance will definitely be getting my business for the tuning. Not sure if the PCMs are the same as the trucks with just a different tune or what.

Valve springs, I'll be running LQ9 heads on this, any pointers on what springs and pushrods to use with the cam I mentioned in my original post? Or do you even recommend a different cam for this engine with the manual transmission? I see a lot of posts with what cam to run with a certain stall torque converter, but I obviously don't have to worry about torque converters. :D

For a clutch, pressure plate and slave, will the LS7 clutch/pressure plate/slave work with the NVG 3500? Those are the questions that have been coming to mind, I'm sure I'll think of more! :D

Bout time man, I got a lot of answers for ya (funny the GM shop dog giving the GM trained tech answers, slightly ironic)

Not ironic. I am in the same boat as license man. I have only starting coming out of the stock is right for new vehicles shell over the last 18-24 months. I used to be mod old stuff and keep the new stuff stock in case I have to fix it LOL.

I still think mine is too new to touch, only 30000 miles. Just done a lot of reading and question asking on this very subject.

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Originally Posted by sleeper1500

Bout time man, I got a lot of answers for ya (funny the GM shop bitch giving the GM trained tech answers, slightly ironic)

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Give me something stock and tell me I can't fix it, I dare ya. :D J/K bud, I know what ya mean. ;)

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Originally Posted by GasGuzzler

Not ironic. I am in the same boat as license man. I have only starting coming out of the stock is right for new vehicles shell over the last 18-24 months. I used to be mod old stuff and keep the new stuff stock in case I have to fix it LOL.

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Same here Nate, I have nothing against modifying anything, just no one does it around here! The guy I'm getting the heads and intake off of is putting an carbureted LS6 into a '68 Camaro who is one of my fellow techs at work, we are researching all this aftermarket stuff together.:hyper2:

So maybe then others can see how hard this is for fixers. :lol:

carb'd LS6... that sounds fun! http://ls1truck.com/forums/images/smilies/biggrin.gif

as for the LS7 clutch, etc, i don't really know if it'd work or not. i'd say just go to your parts counter & grab a 4.8 flywheel & try to bold one up. i know the 4.8/5.3 flywheel is not interchangeable with one off an LS1... or at least that's what i've been told by quite a few different places. the t-56 & nv3500 slave cylinders are swappable, i know that.

wait... you'll be using an LS6 flywheel, correct? i thought you were wanting to reuse your old one, but even then - you have a 4.3, not a 4.8 :smash:

what i do know is that you can't use an LS1 flywheel with a 4.8/5.3, but that's an issue of bolting to the crank. i have no clue whether or not an LS6 flywheel will mate to this transmission... but it will easily go with a t-56, which is what you'll be probably be looking for in the future.

Done yet?

Done yet?