6.2 ls3 GM performance crate engine

Has anybody replaced there vvt / dod 6.2 with a GM performance 6.2 /la3 430hp , I have a 2011 Yukon Denali and the #4 lifter let go and lock up the motor , I would like to replace it with the GM performance crate motor but the service guy at the deal told me I would need a controller added to it and that I would be better off to replace it with a stock 6.2 vvt/dod remanufactured 6.2 plug and go , opinions and advice on this subject is very much appreciated I was looking at the 6.2 long block summit racing has for a decent price and I don’t mind getting a tune for it but a new controller hmmm I’m thinking he’s trying to up sale me , thanks for any advice

someone else asked about this a while back. I don't remember if they ended up doing it or not.

you will atleast need to tune your stock ECM to run without the afm/vvt. which you'll probably want to delete anyways before putting any engine back in.

I feel like I'd send black bear a email and ask them.

A 6.2L ecm is a 6.2L ecm.
Since an L94 is not an LS3, your ecm will need a tune, not only to deactivate VVT & Engine Half@$$,
but for all the other cool stuff too.

I looked into this earlier in the year for my 07, and I was told by GM Crate Engines, Summit Racing and Texas Speed that the electronics differences between my generation and the latest crate engines would be a bridge too far to make the conversion. Is it possible? Well, anything is possible, if you throw enough money at it, but it was not recommended by all 3 of these vendors.

Marky Dissod said:

A 6.2L ecm is a 6.2L ecm.
Since an L94 is not an LS3, your ecm will need a tune, not only to deactivate VVT & Engine Half@$$,
but for all the other cool stuff too.

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OK. yes, many different ecm's can run a 6.2 or any other ls, as long as the crank sensor wheel is the correct tooth.

I was meaning more like you can't drop a non afm/vvt engine into a truck that came stock with it, and then run it off same tune in that ecm without adjustments.

again. once you've deleted a 6.2 of its afm/vvt isn't it just a ls3 at that point? that's why I said talk to someone that tunes them.

the only electrical stuff I can think of would be the need for the cam sensor adapter harness, same one the delete guys use. make make sure the injectors are the correct size in the tune, deactivate afm and vvt?

what's left? you could use a clean up of the vve tables of your cart ls3 had the corvette cam in it? but nothing a tuners can't do while in there?

Reddenali said:

Has anybody replaced there vvt / dod 6.2 with a GM performance 6.2 /la3 430hp , I have a 2011 Yukon Denali and the #4 lifter let go and lock up the motor , I would like to replace it with the GM performance crate motor but the service guy at the deal told me I would need a controller added to it and that I would be better off to replace it with a stock 6.2 vvt/dod remanufactured 6.2 plug and go , opinions and advice on this subject is very much appreciated I was looking at the 6.2 long block summit racing has for a decent price and I don’t mind getting a tune for it but a new controller hmmm I’m thinking he’s trying to up sale me , thanks for any advice

Click to expand...

The LS3 is a Gen IV engine like your L94, all you need is a tune to get it running correctly. The camshaft in those crate motors is for cars, not trucks, if this were my project, I'd change that out to a truck specific camshaft. Probably have to use your oil pan, I think they come with Camaro oil pans. Swap over your intake, injectors, coils, etc. and good to go.

Dave and Michael and Randy are just some of the guys active on here who have changed the camshaft in their 6.2 equipped Denalis and can give you advice on that.

@Geotrash @randeez @petethepug

swathdiver said:

The LS3 is a Gen IV engine like your L94, all you need is a tune to get it running correctly. The camshaft in those crate motors is for cars, not trucks, if this were my project, I'd change that out to a truck specific camshaft. Probably have to use your oil pan, I think they come with Camaro oil pans. Swap over your intake, injectors, coils, etc. and good to go.

Dave and Michael and Randy are just some of the guys active on here who have changed the camshaft in their 6.2 equipped Denalis and can give you advice on that.

@Geotrash @randeez @petethepug

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Yup, perfect. And you can use the L92 cam if you want factory specs and VVT, or switch to a 3-bolt cam if you don't care about VVT and want some more ass from that 6.2. Swapping out the cam is easy peasy - especially when the engine is out of the truck. Don't even have to pull the heads - just slip some 5/16" wooden dowels in from the front, spin the cam to park the lifters above the dowels, and pull out the cam. OP, when you get to that point let us know and we'll guide you through it if needed.

I probably mentioned a cam swap in my other car. I never had the chance to break the L92 or L9H motors to justify a cam swap in them, yet. These damn GM Gen IV 400hp motors are so reliable, they’re almost boring (sometimes )

It could be made to work but an LS3 isn't really the best powerband for a big heavy truck. The VVT makes a huge difference for power down low where a truck needs it the most.

I've done it and very happy I did with 60k miles on the swap. Posted about it most recently here: https://www.tahoeyukonforum.com/threads/ls3-in-2008-yukon-denali.146996/#post-1859017