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

HYB-CPA-01-05 - Hybrid Racing RBC RWD Coolant Port Adapter - K20Z3/K24A/K24Z

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

Tight firewall clearance makes the factory side-exit coolant housing difficult to package in many rear-wheel-drive K-series swaps. Hybrid Racing's RWD coolant port adapter routes the outlet straight off the rear of the cylinder head, creating a compact, direct path for custom cooling-system plumbing.

The 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 AN fitting for a complete AN-plumbed system. The heater port can retain the heater core with the supplied threaded fitting or be sealed with the included -8 ORB plug.

Rear-Exit Cooling for RWD K Swaps

• Rear-exit design improves clearance in tight rear-wheel-drive engine bays
• Retain the heater circuit or delete it using the included -8 ORB plug
• Use a conventional radiator hose or convert to -16 AN plumbing
• Fully machined internal coolant passage promotes smooth, unrestricted flow

Important Intake Manifold Compatibility:

• Requires a rear-wheel-drive-specific intake manifold with clearance behind the cylinder head
• Not compatible with standard transverse K-series intake manifolds
• Not compatible with factory PRB, RBC, or RRC intake manifolds

Key Features:

• Fits RBC-head K20Z3, K24A2, K24A4, K24A8, and K24Z7 engines
• Single-piece billet 6061 aluminum construction
• Durable black anodized finish
• Rear-exit -16 ORB coolant outlet
• Works with the included hose-barb adapter or an aftermarket -16 AN fitting
• Configurable heater port for heater retention or deletion
• Uses an OE-style stamped steel gasket
• Designed for rear-wheel-drive K-series conversions

Engine Fitment:

• 2006-2011 Honda Civic Si (K20Z3)
• 2012-2015 Honda Civic Si (K24Z7)
• 2003-2007 Honda Accord (K24A4/K24A8)
• 2003-2011 Honda Element (K24A4/K24A8)
• 2004-2008 Acura TSX (K24A2)
• 2013-2015 Acura ILX (K24Z7)

Compatible with rear-wheel-drive conversions such as Honda S2000, Subaru BRZ, BMW, 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) Threaded heater-hose fitting
• (1) -8 ORB plug
• (1) Stamped steel gasket
• Mounting hardware

For RWD K-swap builders working with limited space behind the cylinder head, this adapter provides a compact, flexible cooling solution with proper flow and OEM-style sealing.