LS and LT Engine Swap Radiator for 1963-1966 C/K-Series Trucks
If you're fitting an LS or LT motor into a 1963-1966 C/K Series truck, you're likely to face coolant temperature spikes during slow traffic and heavy pulls. The 1963-1966 GM Truck Radiator (Manual Trans) with Fans addresses that challenge by pairing a full width aluminum core with dual electric fans that activate only as needed. Each junction features a 100 percent TIG welded aluminum core for reliable vibration resistance and rapid heat transfer across the 28.25 inch cooling surface. As a direct bolt in for C10 C15 K10 and K15 models, this radiator installs without frame trimming while preserving alternator output for accessories. Built in the USA to factory tolerances, it slips into original mounting points on manual transmission trucks to deliver consistent cooling even under demanding swap conditions.
Precision TIG Welded Aluminum Core for Structural Integrity
Every junction between the tanks and core uses a 100 percent TIG welded process that preserves full material thickness of the high grade aluminum. Uniform weld beads reduce thermal distortion and ensure a leak free bond under constant vibration. This uninterrupted metal interface improves heat transfer from coolant passages into the fins. Weld quality also avoids the need for post assembly filler or machining. As a result this core maintains structural integrity and consistent performance over time.
Adaptive Dual Electric Fans for Dynamic Cooling Control
Two electric fans are mounted directly to the shroud and calibrated to activate only when coolant temperature rises above a set threshold. This adaptive control conserves alternator capacity for headlights and accessories while delivering uniform air flow through the entire 28.25 inch core. Low current draw reduces strain on the charging system. Whether crawling on city streets or pulling heavy loads the assembly responds precisely to thermal demand. Rapid fan engagement prevents temperature spikes during stop and go traffic or track operation.
Finish Selection Balances Aesthetics and Corrosion Resistance
Restorers can choose between the classic bare aluminum finish or a black epoxy coated surface to match aesthetic and functional goals. The bare core emits radiant heat directly while the epoxy layer adds a barrier against moisture, road chemicals and surface oxidation. Both finishes are applied with controlled thickness to preserve factory shroud alignment. Finish choice thus delivers both visual appeal and long lasting resistance in demanding conditions without sacrificing cooling efficiency.
USA Manufacturing Ensures Direct Fitment on C/K Series Trucks
Manufactured in the USA to original tolerances for 1963 through 1966 C10, C15, K10 and K15 manual transmission trucks, this radiator drops into existing mounting points without trimming or adjustment. Local quality controls and inspection protocols validate dimensional accuracy and performance before each unit ships. Installers benefit from a true direct fit that respects the classic frame geometry. This seamless integration maintains original truck lines and delivers reliable cooling under swap conditions.
Count on this radiator for steadfast cooling performance under LS LT swap conditions. For the same radiator but without fans see our 1963-1966 GM Truck Radiator Manual Transmission which uses the same core and mounting design.