Koyo HH063146 1.9" Hyper-Core Racing Radiator for 1983-1985 Mazda RX-7 FC Manual

Vehicle Fitment

• 1983-1985 Mazda RX-7 (FC) 1.1 L / 1.3 L Rotary, manual transmission

Fitment Notes

• Direct-fit replacement for manual-transmission FC Mazda RX-7
• M12x1.25 provision included for low-coolant sensor
• Does not include emissions system sensor provision

Features

• High-density 1.9" Hyper-Core racing design--over 40% thicker than OEM
• All-aluminum construction with brazed tubes and TIG-welded tanks
• Retains OEM fan shroud, hose connections--bolt-on installation
• Polished finish, triple-pressure tested for reliability
• Designed and manufactured in Japan under OE tolerances

Specifications

• Part Number: HH063146
• Core Thickness: 1.9" (48 mm), two rows
• Material: All-aluminum, Nocolok brazed
• Provision: M12x1.25 low-coolant sensor port
• Weight: Approximately 15 lbs

Included Components

• 1x Koyo HH063146 Hyper-Core Racing Radiator
• Installation instructions

Product Description

The Koyo HH063146 Hyper-Core Racing Radiator is a direct-fit upgrade for manual-transmission 1983-1985 Mazda RX-7 (FC) with 1.1 L or 1.3 L rotary engines. Featuring a 1.9"-thick Hyper-Core, this radiator provides substantially improved cooling capacity--ideal for spirited street use and track driving. Its all-aluminum, brazed and TIG-welded construction ensures durability and corrosion resistance.

Installation is simple and seamless: it retains mounting points, fan shroud, and hose connections of the OEM setup, plus includes an M12x1.25 port for the low-coolant sensor. Backed by a premium build and designed to OE-fit standards, the HH063146 offers reliable, high-performance cooling without modifications.