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Can a 3.8 Chevy engine fit in 3.4 2005 impala?

No, a 3.8L Chevy engine will not fit in a 2005 Impala that originally had a 3.4L engine without significant modifications, and those modifications would likely be impractical and cost-prohibitive. The engine bays are not designed for such a swap. The 3.8L is a different size and likely has different mounting points and accessory placement. You'd need to address things like:

* Engine mounts: Completely different.

* Transmission: Probably incompatible.

* Wiring harness: Requires extensive rewiring.

* Exhaust system: Needs to be completely refabricated.

* Cooling system: Likely incompatible.

* Steering components: Potentially interfered with.

While technically *possible* with a tremendous amount of custom fabrication and engineering, it's not a practical or cost-effective swap. It would be far easier and cheaper to find a used 3.8L Impala or a different car with a 3.8L engine altogether.