LS and LT Radiator for 1963-1966 C10/C15 K10/K15 Chevy GMC Trucks
When fitting an LS or LT V8 into a 1963-1966 C10, C15, K10 or K15 chassis, controlling engine and transmission heat becomes a top concern. The 1963 to 1966 GM Truck Radiator (Auto Trans) addresses that challenge with a crossflow design that channels coolant laterally through integrated engine and gearbox passages. Direct port alignment matches factory inlet and outlet locations for a precise fit with no extra brackets. Made from TIG welded aluminum, this radiator delivers durable corrosion resistance and consistent temperature control during towing or highway use.
Precision TIG Welded Aluminum Structure
The radiator is built with fully TIG welded high quality aluminum tanks and core that form a continuous bond across all seams. TIG welding preserves the grain structure of the metal by controlling heat input during assembly, reducing stress points that often lead to leaks or cracks under vibration and thermal cycles. This uniform bond creates rigidity that maintains core flatness over time, ensuring consistent coolant flow across the finned surfaces. Rail and mounting points stay true to specification so that the assembly resists fatigue even under highway loads or heavy towing. Overall, weld integrity adds light weight strength, making the unit both reliable and responsive to thermal demands.
Integrated Crossflow Core for Balanced Engine and Transmission Cooling
This core utilizes a lateral coolant path that channels fluid through separate passages for the engine and the automatic transmission within the same fin pack. Aluminum's high thermal conductivity accelerates heat transfer from both circuits, while optimized fin density increases surface area without obstructing airflow. Integration of the transmission cooler eliminates the need for external plumbing or additional fittings, reducing potential leak points and simplifying the cooling system layout. The balanced flow management keeps engine and gearbox temperatures within safe limits during sustained loads such as towing or highway driving. Sharing cooling capacity between the two circuits also improves overall efficiency when demands shift rapidly.
Choice of Bare Metal or Epoxy Finish for Corrosion Protection
Installers can select an uncoated bare aluminum surface that develops its own protective oxide film or opt for a black epoxy coat that adds an extra barrier against moisture and road contaminants. The bare surface showcases raw metal aesthetics and forms a stable oxide that guards against rust. The epoxy option delivers a uniform finish that resists chipping and stands up to road salt and grime while still permitting effective heat rejection. Both finishes adhere under repeated temperature changes and maintain appearance in vintage engine compartments. These options combine practical corrosion defense with visual customization matched to project goals.
Factory Port Alignment for Streamlined Installation
Ports for inlet, outlet, and transmission lines are positioned to match original 1963 to 1966 frame rail openings, enabling drop in mounting without adapters or custom brackets. This direct port fit preserves factory hose routing and bracket locations for a clean, uncluttered engine bay. Installers save time by avoiding modifications and can reuse original hardware for a professional finish. The lighter aluminum assembly sheds weight compared to steel stock radiators, improving front axle response and steering feel. This precision fit approach reduces labor, simplifies service access, and minimizes potential failure points in LS or LT swap applications.
Count on consistent cooling performance and a precise factory fit for your LS or LT swap. For the same radiator but with fans see our 1963-1966 GM Truck Radiator (Automatic Transmission) with Fans.