Challenges and Considerations:
* Engine Mounts: The biggest hurdle is creating custom engine mounts. The Chevy big-block's bellhousing bolt pattern and overall dimensions are different from the factory Dodge mounts, meaning new mounts will need to be fabricated or purchased from a specialized vendor.
* Transmission: The transmission choice impacts the project. A Chevy TH400 or Turbo 350 automatic would be common choices, requiring an adapter plate to mate to the Chevy engine. A manual transmission would require a similar adapter and likely a custom driveshaft.
* Exhaust System: A custom exhaust system is mandatory. The headers will need to be designed specifically for the swap, considering the Challenger's chassis and clearance issues.
* Wiring: The Chevy engine's wiring harness is incompatible with the Dodge's system. A new wiring harness will need to be fabricated or purchased, integrating with the Challenger's existing systems (lights, gauges, etc.).
* Cooling System: The cooling system may require modifications or upgrades to handle the larger engine's heat output. A larger radiator and possibly an electric fan might be necessary.
* Steering: Depending on the size of the engine and accessories, the steering shaft or components might need adjusting to provide adequate clearance.
* Firewall: The firewall may require modifications for adequate clearance, especially if the engine is particularly large or has tall valve covers.
* Body Mounts/Frame Stiffness: A big-block Chevy is considerably heavier than a typical Challenger engine. This added weight could stress the existing frame and body mounts; reinforcement might be necessary.
* Brakes: Upgrading the braking system is often recommended to handle the increased power and weight of the engine.
What you'll need:
* The Engine: Obviously, a big-block Chevy (e.g., 454, 427)
* Transmission: A suitable automatic (TH400, Turbo 350) or manual transmission with adapter.
* Engine Mounts: Custom-fabricated or purchased.
* Exhaust System: Custom-made headers and exhaust components.
* Wiring Harness: Custom-fabricated or purchased.
* Radiator: Possibly a larger capacity radiator and electric fans.
* Driveshaft: Likely a custom-made driveshaft.
* Fabrication Tools and Skills: Welding, cutting, and metalworking skills are essential.
In short: This is a substantial project requiring mechanical expertise, fabrication skills, and a significant investment in time and money. It's not a job for a novice mechanic. Unless you have experience with engine swaps and fabrication, seeking help from experienced professionals is strongly recommended.
