1967-1987 C/K Series and Blazer/Suburban Radiator for LS and LT Engines
For drivers installing an LS or LT powerplant into a 1967-1987 C/K Series and Blazer/Suburban chassis the GM Truck Radiator 20.75 inch tall automatic transmission unit with dual fans delivers reliable cooling under heavy towing and stop traffic conditions. Equipped with a deep aluminum core and inlet and outlet ports that mirror C10 C15 K10 K15 Blazer and Suburban frame routing the radiator bolts to original bosses with no trimming or adapters required. Available in raw aluminum or black epoxy finish it resists corrosion from road salt moisture and dust to maintain consistent thermal performance over years of service.
Factory Mounting for LS and LT Engine Swaps
This radiator is engineered to attach directly to the original bosses on 1967-1987 C10, K10, Blazer and Suburban frames, preserving the chassis' intended coolant and transmission line routing. By maintaining the stock inlet and outlet locations, installers avoid cutting, welding or fabricating custom brackets. The direct-fit design also retains underhood clearance around steering linkages and brake lines, preventing unwanted interference and reducing the risk of vibration or premature component wear. Technicians appreciate the time saved by eliminating adapter fittings, which translates into quicker turnaround on engine conversions.
Deep 20.75 Inch Aluminum Core for Superior Cooling Capacity
The expansive 20.75 inch tall core increases coolant volume and expands the surface area for heat exchange, making it ideal for trucks that tow heavy loads or endure long climbs. High-grade aluminum tubing and fin material transfers heat up to 60 percent faster than legacy copper and brass systems while resisting internal corrosion for clear coolant passages. Engineers optimized the fin density and tube size to strike a balance between flow rate and dissipation efficiency, ensuring stable temperatures during continuous operation. The lightweight construction also reduces front end mass, enhancing steering response when hauling trailers or navigating off-road terrain.
Thermostat-Activated Dual Fan Assembly for Even Airflow
Two 16 inch electric fans nest within a single molded shroud to pull air uniformly through the entire core height, eliminating hotspots that can form in tall radiators. A pre-wired temperature sensor harness allows plug-and-play connection to factory or aftermarket controllers, triggering fan operation exactly when needed without additional relays or switches. This automation delivers reliable airflow during extended idling, urban traffic or steep climbs, while spreading load across both motors extends their service life. The complete fan pack arrives preassembled for perfect alignment, simplifying installation and guaranteeing maximum performance right out of the box.
Bare Aluminum or Black Epoxy Finish for Lasting Protection
Choose a natural bare aluminum finish to showcase precision TIG welds and allow for light polishing or custom paint, or opt for a black epoxy coat that forms a durable barrier against road salt, moisture and dust. The factory-applied coating adheres securely to the aluminum substrate without adding excess thickness that could impair thermal transfer. This barrier combats environmental corrosion in coastal or winter climates, preserving core integrity and maintaining consistent heat rejection over years of service. Regular inspections confirm that fins remain clear and internal passages free from rust or scale buildup, ensuring peak cooling performance throughout the radiator's lifespan.
For the same radiator but without fans see our 1967-1987 GM Truck Radiator 20.75" Tall (Automatic Transmission) - HD Cooling for dependable cooling on your LS or LT upgrade.