1963-1966 C/K Series Chevy GMC Radiator for LS and LT Engines
Embarking on an LS or LT engine swap in a 1963 to 1966 C/K Series truck demands precise cooling and transmission fluid management, and this 1963-1966 GM Truck Radiator (Auto Trans) delivers that solution. Its high grade aluminum construction and finned core shed nearly 20 pounds compared to the stock steel unit while resisting corrosion in harsh conditions. Precision TIG welding on tanks and core creates a leak resistant seal that holds up under towing and highway driving. Installation is straightforward thanks to factory matched inlet and outlet ports, so coolant circulation stays balanced through both engine and transmission passages even on steep climbs.
Precision TIG Welding Enhances Strength and Reliability
By using TIG welding on all six seams of the tanks and core joints, this radiator achieves uniform weld beads that resist cracking under vibration. TIG welding creates minimal heat zones that preserve the strength of the premium grade aluminum and eliminate weak points found in soldered or bolted joints. This construction technique adds rigidity to the entire assembly, reducing the chance of fatigue over time. The leak proof seal provided by this process ensures coolant and transmission fluid remain contained, giving confidence for heavy towing and daily driving alike.
Efficient Heat Rejection for LS and LT Engine Swaps
A crossflow finned core is designed to move coolant uniformly across both the engine and transmission passages, preventing hot spots under heavy load. Aluminum's superior thermal conductivity accelerates heat transfer so both LS and LT powerplants operate at stable temperatures even on steep slopes or during extended highway use. By balancing flow through the core and the transmission circuit this design prevents heat spikes that can degrade fluid life and reduce component longevity. Fast heat rejection also eases stress on cooling fans and helps maintain consistent performance under demanding driving conditions.
Corrosion Resistance with Bare and Coated Finishes
The choice between natural bare aluminum and black epoxy allows owners to prioritize appearance and protection. Bare aluminum forms a protective oxide surface that blocks rust without additional treatment while the epoxy finish creates a barrier against road salt moisture and chemical attack. Each finish is applied in the US to maintain a uniform surface that stands up to harsh conditions and helps preserve resale appeal. Both options deliver durable defense against environmental wear without compromising cooling efficiency.
Direct Fitment for Seamless C K Series Installation
This radiator features factory matched inlet and outlet ports that align precisely with 1963 to 1966 C10, C15, K10 and K15 frame rails so no custom adapters are needed. Shedding nearly twenty pounds compared to the stock steel original reduces front end load and enhances steering feel on tight turns. As a result installers save time and avoid misalignment issues that can lead to premature hose wear or fluid leaks later in service. The direct fit design also streamlines mounting to stock brackets and simplifies hose routing for a clean engine bay layout.
Count on precise fit and reliable cooling with this aluminum radiator, and for the same radiator but with fans see our 1963-1966 GM Truck Radiator (Automatic Transmission) with Fans.