Hybrid Racing Coolant Port Adapters!
Our new line of coolant port adapters is designed to simplify K-series cooling systems while creating a cleaner, more streamlined engine bay. Available in four versions—two for RBC-style cylinder heads and two for PRB-style cylinder heads—these adapters provide the flexibility to remove unnecessary factory plumbing and support both OEM-style and custom cooling system configurations. While they can be used on factory-engine applications, they were primarily developed for K-series swap projects, and some factory applications may require additional modifications depending on the vehicle and engine combination.
The Hybrid Racing RBC Coolant Port Adapter is a compact, billet 6061 aluminum replacement for the factory coolant outlet on RBC-style K-series cylinder heads. Designed for both OEM-style and custom cooling systems, it features a -16 ORB outlet that accepts the included hose barb fitting or an aftermarket AN fitting, along with a configurable heater port that allows builders to retain or delete the factory heater core. A fully machined internal coolant passage promotes smooth, unrestricted coolant flow, while the black anodized finish provides long-lasting durability. Each kit includes all necessary mounting hardware, fittings, plugs, and a gasket, making it an easy upgrade for street, track, or show car builds.
This Hybrid Racing RWD RBC Coolant Port Adapter is designed specifically for rear-wheel-drive K-series conversions, routing the coolant outlet straight off the back of the cylinder head to maximize firewall clearance in tight engine bays. Machined from billet 6061 aluminum with a durable black anodized finish, it features a -16 ORB outlet compatible with the included hose barb fitting or an aftermarket AN fitting, plus a configurable heater port that allows builders to retain or delete the factory heater core. Its fully machined internal coolant passage ensures smooth, unrestricted coolant flow, while the complete installation kit includes all necessary hardware, fittings, plugs, and a gasket. Designed for use with RWD-specific intake manifolds, it provides a clean, reliable cooling solution for custom K-series swaps.
The Hybrid Racing PRB Coolant Port Adapter is a billet 6061 aluminum replacement for the factory coolant outlet on PRB-style K-series cylinder heads, including the K20A, K20A2, K20A3, K20Z1, and K24A1. Designed to retain the factory thermostat bypass circuit for proper coolant flow and engine warm-up, it features a -16 ORB outlet compatible with the included hose barb fitting or an optional AN fitting for custom plumbing. An integrated 1/8-inch NPT port provides a convenient location for a coolant temperature sensor, eliminating the need for an inline hose adapter, while an OEM-style rubber seal ensures a reliable, leak-free fit. Each kit includes all necessary hardware and fittings for a straightforward installation, making it an ideal upgrade for both stock and custom K-series cooling systems.
This Hybrid Racing RWD PRB Coolant Port Adapter is designed specifically for rear-wheel-drive K-series conversions using PRB-style cylinder heads, including the K20A, K20A2, K20A3, K20Z1, and K24A1. Its compact design routes the radiator outlet off the side of the cylinder head to maximize firewall clearance, making it ideal for tight RWD engine bays. Machined from billet 6061 aluminum with a durable black anodized finish, it retains the factory thermostat bypass circuit while featuring a -16 ORB outlet for OEM-style or AN plumbing and an integrated 1/8-inch NPT port for an aftermarket coolant temperature sensor. An OEM-style rubber seal ensures a reliable, leak-free fit, and each kit includes all necessary hardware for installation. Designed for use with RWD-specific intake manifolds, it delivers OEM reliability with the flexibility needed for custom K-series builds.
Extras:
K20A2/K20Z Waterpump port fitting
Hybrid Racing Water Pump Port Block Off (K20A/A2/Z1/Z3)
