Koyo HH023610 Hyper Core 48mm Aluminum Radiator 1968–1972 Skyline KGC10 L20 MT For Sale

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Part Brand: Koyo

Part Number: HH023610

• 1968–1972 Nissan Skyline KGC10 \"Hakosuka\" (2.0L L20 I6, Manual Transmission)

• Manual transmission only — not compatible with automatic transmission variants
• Fits KGC10 chassis with L20 engine only — does not fit the GT-R trim (KPGC10 chassis w/ S20 engine without modifications)
• OEM radiator cap is not compatible — Koyorad SK-C13 or equivalent modern-style cap is required (sold separately)
• Radiator has been retrofitted with a modern-style filler neck to accept current-spec radiator caps
• OEM fan shroud and coolant hoses are retained — no modifications required for KGC10 L20 applications

• All-aluminum Hyper Core construction delivers over 40% increase in core thickness compared to the OEM radiator
• High-density 48mm core boosts heat capacity and cooling endurance for street and track use
• Hand TIG welded and Nocolok furnace brazed for superior structural integrity and leak resistance
• Triple pressure tested at the factory to ensure leak-free performance before shipment
• Retains OEM mounting provisions, fan shroud fitment, and coolant hose connections — direct bolt-in installation
• Lightweight full-aluminum construction reduces weight over OEM brass/copper radiators
• Designed for spirited street driving and track day use on the KGC10 platform
• Koyorad Hyper Core series — race-proven cooling technology from one of the world\'s leading radiator
• Series: Koyorad Hyper Core (HH-Series)
• Core Thickness: 48mm (1.9 in.)
• Core Increase Over OEM: 40%+
• Material: Full Aluminum
• Construction: Hand TIG welded, Nocolok brazed
• Radiator Cap: Not included — Koyorad SK-C13 or equivalent required
• Filler Neck: Modern-style retrofit (OEM cap incompatible)
• Transmission: Manual only
• Chassis: KGC10

• 1x Koyo HH023610 Hyper Core All-Aluminum Racing Radiator

The Koyo HH023610 is a purpose-built all-aluminum Hyper Core performance radiator designed specifically for the 1968–1972 Nissan Skyline KGC10 \"Hakosuka\" with the L20 inline-six engine and manual transmission. Featuring a 48mm core that is over 40% thicker than the factory unit, this radiator significantly increases the cooling system\'s heat capacity and endurance — an essential upgrade for any KGC10 used on the street or track. All OEM mounting points, fan shroud provisions, and coolant hose connections are retained for a true direct bolt-in installation with no cutting, drilling, or fabrication required.

Built to Koyorad\'s exacting standards, the HH023610 is hand TIG welded, Nocolok furnace brazed, and triple pressure tested before leaving the factory. Note that the filler neck has been retrofitted to accept modern-style radiator caps — the OEM cap will not fit, and the Koyorad SK-C13 or equivalent cap is required and sold separately. Owners of KPGC10 GT-R chassis vehicles with the S20 engine should be aware that modifications will be necessary for installation.

*Parts are for USA spec vehicles, please contact us to verify fitment on JDM & international models.

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• Free shipping across the contiguous 48 United States (excludes Hawaii and Alaska). Item(s) ships on the same day or within 1 business day. Delivery time is within 2 to 4 business days excluding next day deliveries. Orders over $750 require signature for delivery.
• Canada customers - If does not collect import & duty fees during checkout, the shipping carrier will collect them prior to delivery.

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• Any returns received installed, mounted, used or missing components will be subject to return fee\'s.

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