1. Engine Mounts:
* Custom Fabrication: You'll almost certainly need custom engine mounts. Pre-made mounts for this specific swap are unlikely. You'll need to fabricate them yourself or have them professionally made. This typically involves welding and careful placement to ensure proper engine alignment and clearance. You'll be working with the truck's frame and potentially adding reinforcement.
* Motor Mounts: The 350's motor mounts won't directly fit the 1951 truck's frame. You'll need to adapt them, likely using aftermarket adaptors or creating custom brackets.
2. Transmission:
* Transmission Adapter: The 1951 truck likely had a different transmission than a modern 350 would typically use. You'll need a transmission adapter plate to mate the 350's transmission (e.g., TH350, 700R4, etc.) to the truck's existing bellhousing or a replacement bellhousing.
* Driveshaft: The existing driveshaft will almost certainly be too short or the wrong angle. A custom driveshaft will need to be made or sourced.
3. Exhaust System:
* Custom Fabrication: A new exhaust system will be necessary. The existing system won't fit a 350. You'll need to have custom headers and exhaust pipes fabricated.
4. Cooling System:
* Radiator: The stock radiator will likely be inadequate for a 350. You'll probably need a larger radiator, possibly with an electric fan. Consider the placement of the radiator and potential clearance issues.
5. Wiring Harness:
* Custom Wiring: The truck's original wiring harness won't be compatible. You'll need a new wiring harness or significant modifications to adapt it. This requires careful planning and knowledge of automotive electrical systems.
6. Other Considerations:
* Firewall Clearance: The 350 might require firewall modifications for proper clearance.
* Steering: The steering linkage and column might need adjustments or replacements to avoid interference.
* Fuel System: The existing fuel system will likely need upgrading to accommodate the 350's fuel requirements.
* Brakes: Upgraded brakes might be necessary, especially with the added power of the 350 engine.
In summary: This isn't a project for a novice. It requires substantial mechanical skills, fabrication abilities (welding is almost certainly required), and access to specialized tools and equipment. It's strongly recommended to seek the assistance of experienced automotive mechanics or hot rod builders familiar with engine swaps. Consider consulting with a professional shop for quotes and guidance before undertaking such a project. Numerous online forums and communities dedicated to classic Chevy trucks and engine swaps can provide valuable information and support.
