Protect your legendary rotary engine from heat failure with the ultimate cooling upgrade: the Koyorad HH Series N-Flo Racing Radiator (P/N: HH060643N), available at Straight Six Imports. Engineered specifically for the 1989-1992 Mazda RX-7 (FC3S) Manual Transmission models (Turbo and Non-Turbo), this radiator is essential for street performance and track durability.

The rotary engine is notoriously heat-sensitive. Koyorad addresses this with its robust, all-aluminum construction featuring a thick 48mm Hyper "HH" Series core and their innovative N-Flo Dual Pass Technology. By welding internal partitions in the tanks, the coolant is forced through the core multiple times, increasing its residence time and maximizing heat transfer efficiency—a critical feature for high-output FC3S applications.

Key Performance Features for the Mazda RX-7 FC3S:

• N-Flo Dual Pass Technology: Forces coolant through the core twice, significantly increasing heat dissipation over standard radiators.

• 48mm "HH" Hyper Core: A thick, high-density core engineered for extreme heat loads, common in turbocharged and high-RPM rotary use.

• All-Aluminum Construction: Fully TIG-welded, Nocolok-brazed construction eliminates the weak points of plastic end tanks found on OEM units.

• Direct OEM Fitment: Designed for a hassle-free, direct bolt-in installation, retaining the factory fan shroud mounts. Requires manual transmission.

• Accessory Port: Includes a 1/8” NPT port with plug for easy integration of aftermarket temperature sensors and gauges.

• Billet Filler Neck: Features a precision-machined billet aluminum filler neck for superior sealing and durability.

Secure the performance and reliability of your FC3S drivetrain. Shop the race-proven Koyorad HH060643N N-Flo Radiator at Straight Six Imports today.