Radiator for LS and LT Swaps in 1967-1987 C/K Series Trucks and Blazer/Suburban
Swapping an LS or LT into a 1967 to 1987 C slash K Series Chevy or GMC truck pushes cooling demands beyond what original radiators can meet and the 1967-1987 GM Truck Radiator 20.75 inch tall model for automatic transmission closes that gap with a taller core and greater coolant capacity. Crafted from corrosion resistant aluminum and featuring optimized fin geometry it channels airflow evenly across the core to avoid thermal hotspots under heavy loads. By boosting fluid capacity by more than 25 percent it smooths temperature spikes during steep grades slow speed traffic and hot ambient conditions. Installation stays simple since factory mounting points on 1967 through 1987 C slash K pickups and Blazer or Suburban chassis match without custom brackets.
Uniform Heat Transfer from 20.75 Inch Tall Core
The 20.75 inch tall core delivers steady airflow across its full height thanks to precisely arranged fin spacing. This design channels air evenly to every coolant passage and prevents localized hot spots that can stress head gaskets and engine bearings. Stability in coolant temperature is critical during steep grades and low speed towing, where a standard height radiator may struggle to dissipate heat quickly. By aligning with factory mounting points on 1967 through 1987 C/K series trucks and Blazer or Suburban chassis, installation remains straightforward without custom brackets or modifications.
Aluminum Body for Fast Heat Rejection and Weight Savings
Constructed entirely from high quality aluminum, the radiator leverages the metal's superior thermal conductivity and natural oxide barrier to reject heat rapidly under load. Heat moves efficiently through the aluminum walls, enabling the engine to maintain safe operating temperatures whether on extended highway runs or in extreme summer heat. The inherent light weight of the material also reduces stress on suspension components and mounting hardware, preserving steering feel and chassis balance. Domestic manufacturing ensures each unit meets exact fit and finish standards for automatic transmission applications.
Expanded Coolant Volume for Temperature Stability under Load
With over a 25 percent increase in coolant capacity compared to original radiators, this model adds a vital thermal buffer that smooths out rapid temperature spikes when hauling trailers or crawling through rugged terrain. The additional fluid mass acts as a heat sink during slow speed traffic and mountain passes, reducing the frequency of heat cycles that can lead to premature coolant breakdown. Keeping coolant temperatures in check also extends service intervals, since lower operating temperatures slow chemical degradation and preserve system integrity.
Bare Aluminum or Black Epoxy Finish to Match Engine Bay Needs
Choose the raw aluminum surface to maximize heat rejection or opt for the black epoxy coating to guard against corrosion in humid or salty environments. Both finishes apply a thin protective layer that does not obstruct airflow through the fins, ensuring full cooling performance is retained. The epoxy coat provides a durable barrier against road debris while keeping the radiator’s profile slim for tight engine compartment clearances. Maintenance is straightforward and each finish complements the look of both classic and modern underhood setups.
For the same radiator but with fans see our 1967-1987 GM Truck Radiator 20.75" Tall (Automatic Transmission) with Fans - HD Cooling and trust in reliable temperature control for your LS and LT swap.