Hybrid Racing RBC FWD K Swap Coolant Port Adapter Housing for K20Z3/K24A/K24Z
Hybrid Racing RBC Coolant Port Adapter – Honda K20Z3, K24A, K24Z7 FWD
Upgrade your Honda or Acura K-series cooling system with the Hybrid Racing RBC Coolant Port Adapter, designed for front-wheel-drive K20Z3, K24A, and K24Z7 engine applications. This billet aluminum coolant housing replaces the bulky factory coolant outlet with a compact, high-flow solution that supports factory radiator hoses or custom -16AN coolant plumbing.
Whether you're building a K-swapped Honda Civic, upgrading an Acura RSX, cleaning up your engine bay, or converting to AN coolant lines, this adapter provides improved hose routing flexibility, durable construction, and a clean aftermarket appearance.
Manufactured from a single piece of precision-machined 6061 aluminum and finished in black anodizing, the Hybrid Racing coolant port adapter is engineered for performance street cars, track builds, and custom K-series engine swaps.
Key Features & Benefits
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CNC-Machined 6061 Billet Aluminum: Durable, lightweight construction with a premium black anodized finish.
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Compact Coolant Housing Design: Replaces the bulky factory coolant port for cleaner engine bay aesthetics and improved routing flexibility.
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-16 ORB Radiator Outlet: Compatible with the included radiator hose barb adapter or an optional -16AN fitting for custom coolant plumbing.
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Optional Heater Core Delete: Includes a -8 ORB plug to eliminate the heater hose connection on race and track builds.
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Retain Factory Heater Functionality: Supplied threaded heater fitting allows continued use of the factory heater core.
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Fully Machined Coolant Passage: Smooth internal passage designed to promote unrestricted coolant flow.
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FWD K-Series Compatibility: Designed for compatible Honda and Acura K-series engine applications using the specified coolant port configuration.
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Complete Installation Kit: Includes gasket, hardware, radiator hose fitting, heater fitting, and heater delete plug.
Factory Radiator Hose or -16AN Coolant Line Compatibility
The Hybrid Racing RBC coolant port adapter features a -16 ORB threaded outlet, giving builders flexibility when configuring their cooling system.
Factory-Style Radiator Hose Setup
Use the included -16 ORB to hose barb adapter to connect a standard radiator hose without converting the entire cooling system to AN fittings.
For a secure connection, Hybrid Racing recommends upgrading older factory spring clamps to quality T-bolt clamps. Worn factory clamps may not provide sufficient sealing pressure on aftermarket coolant fittings.
Custom -16AN Cooling System
For performance builds utilizing braided AN coolant lines, the threaded outlet accepts a compatible -16AN to -16 ORB fitting (sold separately).
This configuration is ideal for custom radiator installations, K-series engine swaps, and engine bay tuck projects requiring flexible coolant hose routing.
Heater Core Retention or Heater Delete
Designed to accommodate both street-driven and dedicated race applications, this adapter includes the components necessary to configure your heater coolant connection.
Retain Your Heater: Install the supplied threaded heater hose fitting to maintain the factory heater core connection for street-driven vehicles.
Delete Your Heater: Install the included -8 ORB plug to eliminate the heater hose connection for a simplified cooling system and cleaner engine bay.
Both configurations are supported with the included hardware, eliminating the need to purchase separate coolant housings.
Honda & Acura K-Series Engine Fitment
Compatible with the following engine applications when equipped with the appropriate coolant port configuration:
| Engine | Vehicle Application | Model Years |
|---|---|---|
| K20Z3 | Honda Civic Si | 2006–2011 |
| K24A2 | Acura TSX | 2004–2008 |
| K24A4 | Honda Accord | 2003–2005 |
| K24A4 | Honda Element | 2003–2006 |
| K24A8 | Honda Accord | 2006–2007 |
| K24A8 | Honda Element | 2007–2011 |
| K24Z7 | Honda Civic Si | 2012–2015 |
| K24Z7 | Acura ILX | 2013–2015 |
Important Fitment Information: This adapter is intended for front-wheel-drive applications with a compatible cylinder head coolant outlet. Engine swaps and modified cylinder heads should be verified before ordering. Rear-wheel-drive K-series conversions require the separately available RWD coolant port adapter.
What's Included?
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(1) Hybrid Racing billet aluminum coolant port adapter
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(1) Stamped steel coolant port gasket
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(1) Mounting hardware kit
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(1) -8 ORB heater delete plug
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(1) Threaded heater hose fitting
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(1) -16 ORB to radiator hose barb fitting
Product Specifications
| Specification | Details |
|---|---|
| Manufacturer | Hybrid Racing |
| Product Type | RBC Coolant Port Adapter |
| Material | CNC-Machined 6061 Aluminum |
| Finish | Black Anodized |
| Radiator Outlet | -16 ORB |
| Heater Port | -8 ORB Plug or Heater Fitting |
| Application | Honda/Acura K-Series |
| Drivetrain Configuration | Front-Wheel Drive |
| Installation | Bolt-On with Compatible Cylinder Head |
Upgrade Your K-Series Cooling System
Whether you're building a turbocharged Honda Civic Si, performing a K24 engine swap, or upgrading your Honda/Acura engine bay, the Hybrid Racing RBC Coolant Port Adapter provides a versatile solution for custom coolant routing.
With precision-machined construction, factory hose compatibility, optional -16AN plumbing, and flexible heater core configurations, this coolant housing is an excellent upgrade for street, track, and performance K-series builds.
