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Hybrid Racing RBC RWD Coolant Port Adapter for K20Z3/K24A/K24Z

In stock
Regular price $199.99
Product INFO
  • Vendor Hybrid Racing
  • SKU HYB-CPA-01-05
In stock
Usually ships within 24 hours
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  • Designed for Rear Wheel Drive (RWD) K Swaps
  • Compatible with K20Z3, K24A, K24Z Swapped RWD Chassis
  • Works with -16 ORB to -16 AN or Barbed Hose Fittings
  • Uses OE-Style Stamped Gasket

Hybrid Racing RWD RBC Coolant Housing Adapter - K20Z3, K24A & K24Z7

Anyone who's put a K-series into a rear-wheel-drive chassis knows the problem: the firewall is right there. This adapter routes the coolant outlet straight off the back of the cylinder head instead, which is a much smarter path in a tight RWD bay. It's compact, machined from a single piece of 6061, and turns a packaging headache into a clean cooling layout.

Read This First: Manifold Compatibility

Because the coolant outlet exits from the rear of the cylinder head, this adapter is not compatible with standard transverse K-series intake manifolds, including the factory PRB, RBC, and RRC manifolds. It is built for rear-wheel-drive-specific intake manifolds that leave room behind the cylinder head. If your RWD build runs the standard side-exit setup, our FWD RBC coolant housing adapter is the one you want.

Keep Your Heater Or Do A Clean Heater Delete

Keeping the heater? Use the supplied threaded fitting. Doing a heater delete? Cap it with the included -8 ORB plug. Both options ship in the box.

Run Factory Hoses Or Go Full AN

The outlet is a threaded -16 ORB. Thread in the included -16 ORB to hose barb fitting for conventional radiator hoses, or run a -16AN fitting (sold separately) to plumb the whole cooling system in AN line.

Machined For Flow

The internal coolant passage is fully machined rather than left as-cast, so coolant moves through smoothly without unnecessary turbulence or restriction, with OEM-quality sealing.

What's In The Kit

  • Billet coolant port adapter
  • Stamped steel gasket
  • Mounting hardware
  • -8 ORB plug (for heater delete)
  • Threaded heater hose fitting (to retain the heater)
  • -16 ORB to hose barb radiator fitting

Fits These RBC-Head K-Series Engines

K20Z3, K24A2, K24A4, K24A8, and K24Z7 in rear-wheel-drive conversions (S2000, BRZ, BMW, and similar). Requires an RWD-specific intake manifold. Not compatible with standard transverse K-series manifolds.