2005 Yukon XL 5.3 L59 to LM7

[Ekreider89]

We have a 2005 Yukon XL with 212,000 miles. It’s a western car so no rust. Lifter started making noise a week or so ago, mechanic thinks the roller isn’t spinning this scratching the cam shaft.

Instead of doing a top end job, I’m thinking about a engine with less miles. Around me I can’t find many L59s but LM7s are very plentiful.

I know the fuel injectors are different, wondering how easy a swap to a LM7 would be? I want to make this as seamless as possible, but if you can do it easily then I’m open to it.

Thanks,
Eric

 

[MassHoe04]

This was a pretty decent write-up on the differences between the L59 (flex-Fuel) and the LM7 (gas).

L59 Vs. LM7 Engine : What’re the Differences? | Rx Mechanic

Distinguishing two engines having similar physical looks from the same manufacturer can be tricky. In this L59 Vs. LM7 debate, get both engines reviewed.

rxmechanic.com

Fuel rail, injectors, sensors should come over.
The ECM/PCM (the computer thing) for the LM7 would probably be good to also have transplanted.

There may be differences in the fuel pump hook-ups/wiring that need to be considered.

I have never done one, so I don't know if anything more is involved, but I am sure a few members here are expert enough to guide you further along.

Just be sure you have all your ducks in order and assemble all the bits you will need, if you pull the trigger.