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So I recently purchased a 2004 impala ss. I am thinking of doing an LS1 swap. I was wondering if anyone has any experience with this. If so, how hard is it? Do the bolts line up?
 

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For your 04, a LS4 engine/ trans from a Monte SS, Impala SS or GP-GXP is what you’d need…but be prepared for a huge list of mods to make it compatible with your car. Adding a turbo to your 3800 will make more power and cost you a lot less. ZZP and 3800Performance both offer conversion kits


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To successfully install an LS4 you'll need a complete donor car.
Buick LaCrosse Super, Impala SS, Pontiac GXP, or Monte Carlo SS. The 4T65E-HD in the LS4 cars is still a fairly fragile transmission so keep that in mind.

It'd be easier to install the Supercharged 3800 from the 04 or 05 Impala SS or Pontiac GTP. Or as LunaEagle stated... turbocharge your 3800.
 
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