Hybrid Racing PRB RWD Coolant Port Adapter - K20A/K20Z1/K24A1

HYB-CPA-01-07 - Hybrid Racing PRB RWD Coolant Port Adapter - K20A/K20Z1/K24A1

Route coolant cleanly in a rear-wheel-drive PRB-head K swap

Firewall clearance is limited in most rear-wheel-drive K-series conversions, and the factory coolant outlet points directly into that tight space. Hybrid Racing's PRB RWD coolant port adapter turns the radiator outlet out the side of the cylinder head, creating a more practical route for cooling-system plumbing while freeing up valuable space behind the engine.

The compact housing is fully machined from a single piece of 6061 aluminum and finished in black anodizing. Its threaded -16 ORB outlet works with the included hose-barb fitting for conventional radiator hose or with a -16 ORB to -16 AN fitting for a complete AN-plumbed cooling system.

Side-Exit Cooling for RWD K Swaps

• Side-exit design improves firewall clearance in tight rear-wheel-drive engine bays
• Use a conventional radiator hose or convert to -16 AN plumbing
• Retains the factory thermostat bypass circuit for proper warm-up flow
• Includes a 1/8-inch NPT port for an aftermarket coolant-temperature sensor
• Fully machined internal coolant passage promotes smooth, unrestricted flow

Important Intake Manifold Compatibility:

• Requires a rear-wheel-drive-specific intake manifold with throttle-body clearance
• Not compatible with standard front-wheel-drive K-series intake manifolds
• The side-exit coolant outlet will interfere with the throttle body on standard FWD manifolds

Key Features:

• Fits PRB-style K20A, K20A2, K20A3, K20Z1, and K24A1 cylinder heads
• Single-piece billet 6061 aluminum construction
• Durable black anodized finish
• Side-exit -16 ORB coolant outlet
• Works with the included hose-barb adapter or an aftermarket -16 AN fitting
• Machined pocket uses an OEM-style rubber seal with no RTV required
• Designed specifically for rear-wheel-drive K-series conversions

Engine Fitment:

• 2002-2006 Acura RSX engines (K20A/K20A2/K20A3)
• 2002-2005 Honda Civic Si EP3 engines (K20A3/K20Z1)
• 2002-2006 Honda CR-V engines (K24A1)

Compatible with rear-wheel-drive conversions such as Honda S2000, Nissan 240SX, Subaru BRZ, BMW 3 Series, Mazda Miata, and similar chassis when used with an RWD-specific intake manifold.

What's Included:

• (1) Billet coolant port adapter
• (1) -16 ORB to hose-barb radiator fitting
• (1) OEM-style sealing gasket
• Mounting hardware

For RWD K-swap builders working with limited room behind the cylinder head, this adapter provides a compact side-exit cooling solution with proper flow, OEM-style sealing, and a dedicated location for a coolant-temperature sensor.