Here's why:
* Size and Weight: The supercharged 3800 Series II is a considerably larger and heavier engine than the naturally aspirated 3.4L V6 that came in the Grand Am GT. The engine bay simply isn't designed to accommodate it.
* Mounting Points: The mounting points for the 3800 supercharged engine are different from the 3.4L. You'd need to fabricate entirely new engine mounts.
* Wiring Harness and ECM: The wiring harness and Engine Control Module (ECM) are completely incompatible. You'd need a custom wiring harness and potentially a standalone engine management system.
* Exhaust System: The exhaust system would need to be completely redesigned and fabricated.
* Transmission: While you *might* be able to adapt a compatible transmission, it would be a major undertaking.
While technically *possible* with extreme fabrication and engineering skills, the cost and effort involved would far exceed the value of the resulting vehicle. It would essentially be building a custom car from the ground up, rather than a simple engine swap. It's simply not a feasible project for most people.
