Honda K-Series K20Z3 / K24 Aluminium Upper Coolant Housing with Straight Elbow Filler Neck

Product Overview

This silver aluminium upper coolant housing is made for Honda K-series engines, listed for the K20Z3 and most K24 cylinder heads. It replaces the factory upper water outlet with a solid aluminium housing that includes a straight elbow filler neck for the upper radiator hose. Builders often choose this style of housing during K-swaps to simplify hose routing and provide a convenient high filling point for the cooling system. Aluminium also resists the heat cycling that can make ageing plastic outlets brittle.

Key Features and Benefits

• Solid aluminium construction
• Straight elbow filler neck design
• Silver finish
• Suits K20Z3 and most K24 heads
• Helpful for K-swap cooling layouts
• Provides a convenient high point for filling and bleeding

Vehicle Compatibility

The supplier lists this housing for the K20Z3 and most K24 heads, specifically excluding the K24A1. No vehicle models or years are given. Fitment is supplier-stated and not independently verified, so please confirm your engine code and head type before ordering.

Product Specifications

• Product type: upper coolant housing
• Material: aluminium
• Colour: silver
• Engine: K20Z3, most K24 heads (excluding K24A1)
• Package size: 26 x 10 x 8 cm
• Gross weight: approx. 0.85 kg

Installation and Usage

Make sure the engine is cold before draining the coolant. Remove the factory upper housing, clean both sealing faces and fit the new housing with a new gasket or O-ring as appropriate. Tighten the bolts evenly, reconnect the radiator hose and refill with the correct coolant. Bleed the system thoroughly and check for leaks once the engine reaches operating temperature. Professional installation is recommended for engine swap projects.

Package Contents

Upper coolant housing as pictured. The supplier has not confirmed whether a radiator cap, thermostat, gasket, hose or bolts are included, so other contents are not confirmed.

Important Fitment Notice

Engine swaps on road-registered vehicles in New Zealand may require LVV certification. Please send us your VIN or chassis number along with your engine code before ordering so we can help confirm fitment.