* Size: A 572 big-block is considerably larger and wider than the stock 4.6L V8. You'd need to heavily modify or fabricate the engine bay, potentially including firewall modifications, inner fender well removal, and custom fabrication of mounts.
* Weight: The added weight of the 572 will significantly impact the handling and performance of the Crown Vic, potentially requiring chassis reinforcement.
* Exhaust: Routing the exhaust system around the larger engine would be a significant undertaking.
* Cooling: The larger engine will generate significantly more heat, requiring a much more robust cooling system, possibly including custom radiators and cooling fans.
* Transmission: You'd likely need a heavy-duty transmission capable of handling the torque of the 572, which may not be a direct bolt-on replacement for the original transmission.
* Wiring: The electrical system would need significant modification to accommodate the larger engine's needs.
While some extremely dedicated engine swap enthusiasts might attempt this, it's a project that requires an exceptionally high level of mechanical skill, fabrication expertise, and a substantial budget. It's far beyond a simple swap. It's more realistic to consider a smaller big-block or a different platform entirely if you're aiming for that level of engine displacement.
