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What kind of engine can you put in a 2001 Ford Crown Victoria police interceptor without making any adjustments?

You can't put a different engine in a 2001 Ford Crown Victoria Police Interceptor without *any* adjustments. Even swapping in an identical engine from another Crown Vic would require some level of work (like disconnecting and reconnecting various components).

The only engine that would require the *least* amount of modification would be another 4.6L Modular V8 (either the 2V or 3V variant, depending on the original engine) from another similar year Crown Victoria or similar Ford vehicle. Even then, you'd need to deal with things like engine mounts, wiring harnesses, and potentially the transmission depending on the exact specifics of the donor engine and the vehicle's original configuration.