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Will a 4.6 liter V8 Ford Mustang engine fit on 1996 3.8 V6 Mustang?

A 4.6L V8 from a Mustang will *generally* fit into a 1996 Mustang chassis originally equipped with a 3.8L V6, but it's not a straightforward swap. You'll need more than just the engine. Here's why:

* Engine Mounts: The V6 and V8 engine mounts are different. You'll need V8 engine mounts and possibly some fabrication work to make them fit properly.

* Transmission: The V6 likely has an automatic transmission that won't work with the V8. You'll need a V8-compatible transmission (automatic or manual), along with the associated driveshaft, bellhousing, and potentially the rear axle (depending on the transmission and gearing).

* Wiring Harness: The V6 and V8 wiring harnesses are different. You'll need a V8 wiring harness or extensive rewiring.

* Computer (ECU): You'll need a V8 computer (ECU) programmed to work with the engine and the associated sensors.

* Exhaust System: The V8 exhaust system is different. You'll need a V8 exhaust system or have one custom-made.

* Cooling System: The V8 cooling system might require modifications or upgrades to handle the additional heat.

* Brakes: A V8 produces more power, so upgrading the brakes might be necessary for safe handling.

In short, while the engine *might* physically fit into the engine bay, numerous other components need to be changed or adapted for a successful swap. This is a significant undertaking that requires mechanical knowledge and expertise. It's not a simple bolt-on operation.