Here's a breakdown of what you'll need to consider:
* Engine Mounts: The 455 is a larger and heavier engine. You'll almost certainly need custom motor mounts or significantly modify existing ones to accommodate the larger engine.
* Exhaust System: The 455's exhaust manifolds or headers will be different, requiring a new exhaust system.
* Transmission: This is crucial. The easiest bolt-up transmission for a 455 would be a Turbo Hydra-Matic 400 (TH400) automatic. This transmission was commonly paired with the 455. A manual transmission is possible, but it's more complex and requires finding the right bellhousing and potentially a custom driveshaft. Using a TH400 from a car that originally had a 455 is ideal, as it'll have the correct bellhousing.
* Steering: The larger engine might interfere with steering components. You may need to adjust or replace steering linkage.
* Radiator: A larger radiator and possibly an electric fan will be necessary to handle the increased cooling demands of the 455.
* Oil Pan: The 455 oil pan might need modification or replacement to clear the frame or crossmember.
* Wiring: The wiring harness might need modification to accommodate the 455's different sensors and electrical requirements.
* Power Steering: The power steering pump may need to be changed or adapted.
In short: While physically possible, fitting a 455 into a 1972 LeMans isn't a straightforward swap. It requires significant mechanical knowledge, fabrication skills, and access to parts. You'll likely need a professional mechanic's help or considerable experience with engine swaps. Just bolting it in isn't feasible; planning and modifications are essential.
