Performance Koyo Radiator, Mazda RX7, FC S4, 86-88, 48mm, (KH060642)

Koyorad HH060642 / KH060642 – HH Series Radiator (48mm Core)

Upgrade your RX-7’s cooling system with the Koyorad HH Series Radiator (HH060642). Built for serious performance and reliability, this radiator is the ultimate upgrade for your 1986–1988 Mazda FC RX-7 S4 (13B / 13BT). Whether you’re cruising the streets or hitting the track, this radiator ensures your engine stays cool under pressure, so you can focus on pushing the limits.

No more worrying about overheating or unreliable stock components. The Koyorad HH Series offers a 48mm high-density aluminum core with ultra-tight fin pitch for maximum heat dissipation. Lightweight and durable, it’s designed to handle extreme temperatures, so you get top-notch cooling no matter how hard you push your RX-7.

Installation is a breeze, with OE-specific mounts that allow you to use your stock fans, hoses, and brackets—no modifications needed. Handcrafted with precision, the billet filler neck and Nocolok brazed components ensure this radiator stands up to vibration, weather, and long-term use.

Features and Benefits:

• 48mm High-Density Core – Maximizes cooling performance, keeping your engine running at optimal temperatures during high-load conditions.

• Ultra-Tight Fin Pitch – Increases surface area for better airflow and more efficient heat dissipation.

• All-Aluminum Construction – Reduces weight while offering enhanced corrosion resistance and durability for long-term use.

• Handcrafted Heliarc Welds – Guarantees a strong bond between aluminum components, ensuring long-lasting strength and performance.

• Precision-Machined Billet Filler Neck – Ensures secure sealing under pressure, preventing leaks and maintaining high pressure.

• 1/8” NPT Sensor Port – Includes plug and supports easy integration with aftermarket temperature gauges.

• Direct Fit with OE-Specific Mounting – No modification required; it uses your stock fans, hoses, and brackets, making installation quick and simple.

• External Transmission Cooler Required – For automatic transmission vehicles, an external cooler is necessary to maintain optimal transmission performance.

Made for Performance and Durability

Whether you're a track enthusiast or a daily driver, the Koyorad HH Series radiator is built to handle the toughest conditions. Say goodbye to unreliable stock radiators and experience superior cooling for your RX-7 with the HH060642. With its lightweight construction, strong welds, and no-compromise performance, it's the upgrade your car deserves.

Technical Specifications: