1963-1966 C/K Series Chevy GMC Truck Radiator for LS and LT Engine Swaps
When fitting an LS or LT motor into a 1963-1966 C/K Series truck, the 1963-1966 GM Truck Radiator (Manual Trans) with Fans keeps coolant temperatures in check under stop and go traffic or heavy towing. Featuring a full width aluminum core paired with twin electric fans that engage only when needed, this assembly slips into factory mounting points on C10 and K10 models without frame trimming. Each junction uses a 100 percent TIG welded aluminum core for reliable vibration resistance and efficient heat transfer across the 28.25 inch surface. Built in the USA, it maintains alternator capacity and delivers steady performance during demanding LS LT swap projects.
Precision TIG Welding Ensures Core Integrity
Every joint between the tanks and the core is formed using a 100 percent TIG welding process that maintains full material thickness of the high grade aluminum. This method delivers a seam free of filler or machining marks, which reduces the risk of weak points under heavy vibration. By avoiding interruptions in the metal interface, heat transfer from coolant passages into the fin array remains consistent across the entire 28.25 inch cooling surface. The uniform weld beads also limit thermal distortion during repeated heating cycles, preserving radiator geometry for reliable performance. As a result, your C/K Series swap project benefits from a weld quality that stands up to long hours of towing or city crawling without leaks or fatigue.
Adaptive Dual Electric Fans Optimize Airflow
Two strategically mounted electric fans engage only when coolant temperature exceeds a preset threshold, ensuring that airflow is delivered precisely when it is needed. This on demand operation conserves alternator capacity for lighting and accessories, a vital advantage when running modern electronics on a classic truck. The fans draw air evenly through the entire core face, preventing hotspots that can lead to boiling or coolant loss under heavy load. Rapid activation also avoids temperature spikes during slow traffic or high ambient heat, maintaining stable engine temperature. Together, these fans support both highway cruising and heavy towing by reacting to thermal demand in real time.
Durable Finish Options for Corrosion Protection
Choose a classic bare aluminum surface or a black epoxy coated finish to balance heat rejection with environmental resistance. The bare core offers direct radiant cooling, while the epoxy layer provides a barrier against road chemicals, road salt and moisture. Both finishes are applied at a controlled thickness that does not interfere with fan shroud alignment or mounting geometry. This flexibility lets restorers and builders maintain period aesthetics or opt for added protection without compromising cooling efficiency. With either choice, you get a surface treatment designed to endure years of exposure in varied weather conditions.
Built in USA for Authentic Direct Fitment
Manufactured in the USA to the exact tolerances of 1963 through 1966 C10, C15, K10 and K15 manual transmission trucks, this radiator drops into original mounting points without any frame trimming. Strict quality protocols validate critical dimensions and flow performance before shipment, so installers can count on a true bolt in experience. The design preserves alternator capacity and accessory drive alignment, avoiding modifications that could affect charging output. By matching factory geometry, this assembly retains the classic lines of your C/K Series truck and ensures consistent cooling under the unique demands of LS or LT swaps. Local production also means faster lead times and reliable availability for restoration deadlines.
Count on stable performance in any driving condition; for the same radiator but without fans see our 1963-1966 GM Truck Radiator Manual Transmission.