Radiator Chevy Double Pass 26in x 19in 20an

The Radiator Chevy Double Pass 26in x 19in 20an from FSR Racing is a high-performance cooling solution engineered for serious engine builders and hot rod enthusiasts who demand maximum thermal efficiency. Whether you're running a street performance build, a weekend track car, or a custom project requiring aggressive cooling capacity, this dual-pass radiator replaces restrictive OEM units with a purpose-built aluminum core designed to handle elevated coolant flow rates and sustained heat rejection. Built for Chevy platforms, this radiator addresses the thermal challenges that emerge when upgrading ignition timing, fuel delivery, or displacement—where factory cooling becomes a limiting factor in reliability and power.

The double-pass design increases dwell time for coolant within the core, enabling more efficient heat transfer across the aluminum fin matrix compared to single-pass designs. This configuration works by routing coolant through the radiator in two separate paths, creating turbulent flow patterns that prevent thermal stratification and hot spots. The 20 AN (AN20) inlet and outlet ports accommodate braided stainless steel hose or aluminum hard lines, allowing custom plumbing layouts that optimize packaging in tight engine bays or modified chassis. At 22.2 lbs, the aluminum construction delivers lightweight thermal capacity—critical for vehicles where unsprung weight reduction improves handling and suspension response. The compact 26-inch width and 19-inch height fit within typical Chevy radiator support dimensions while the overall depth accommodates modern cooling fan assemblies.

This radiator suits builders working on 1960s–1980s Chevrolet platforms—Corvettes, Camaros, muscle cars, and vintage truck restorations—where OEM cooling proved inadequate for performance modifications. It's equally at home in modern LS-swapped hot rods or carbureted big-block builds where standardized radiator dimensions are insufficient. Verify your vehicle's radiator support clearances and mounting tab locations before purchase; AN20 port sizing requires matching hose fittings and a functioning water pump capable of supporting increased flow demand. Pair this radiator with a properly sized mechanical or electric cooling fan to maximize the thermal rejection potential of the core.