Will a Pontiac 400 fit in a 1966 caprice?

A Pontiac 400 engine can physically fit into a 1966 Chevrolet Caprice with some modifications, as both are full-size vehicles. However, significant adjustments may be needed for engine mounts, transmission compatibility, and exhaust routing. It's also important to consider the vehicle's cooling system and electrical connections to ensure proper integration. While it’s technically feasible, the swap may require custom fabrication and tuning for optimal performance.