LS3 in 2010 Silverado

[eric8]

From what I have read, this should be very straightforward as the 5.3 shares the same architecture as an LS3, but I would like to confirm how straightforward this will be before I order anything.

I have a 2010 Silverado 1500, regular cab short bed with the 5.3 engine and 6speed auto transmission. Truck also has the tow package so it has the heavy duty radiator, oil cooler, transmission cooler, locking rear differential, etc. etc. The plan is to buy an LS3 crate engine from GMPP and drop it in, and just sell the original 5.3.

Here are my questions: If I use the ECU that comes with the crate motor, how will it interface with the factory components (door locks, etc. etc.)? Or, would the best route be to just load an LS3 tune into the factory 5.3 computer and call it a day (if that is even possible)?

My fabrication skills are lacking, but I can handle an engine swap if it's a plug and play affair. Tell me whatcha think.

[Frenchy]

Plug and play, you don't need any electronics for the LS3, just swap everything over from the 5.3, and yes the 5.3 PCM will be able to be tuned for the LS3

[chevyboy.520]

Is the Ls3 coming with the L92 style intake manifold? That will need to changed, cuz the Ls3 intake is too short to fit your water pump and alt and all that. And the intake on then5.3 is a cathedral port not rectangular port.

[chevyboy.520]

http://www.performancetrucks.net/for...90#post4612390
Here is one on PT.net for sale, hope I can help your swap!

[pl4yboy]

The 5.3 should have the new fuel module that is required since it already has the 6l80

[chevyboy.520]

So the only thing different is the head intake ports ?