Product Overview
Streamline your Honda K-series engine swap with the iFJF K Series Intake Manifold Coolant Adapter. Whether swapping a K20 or K24 into a Miata, Civic, CRX, or track car, the factory coolant routing at the intake manifold is often a packaging nightmare. This billet aluminum adapter replaces the bulky OEM plastic coolant housing with a compact, durable AN fitting solution that clears tight engine bays and simplifies hose routing for a cleaner, more professional engine bay.
Key Features
Billet Aluminum Construction: CNC-machined from 6061-T6 aluminum — far stronger and more heat-resistant than the factory plastic housing that becomes brittle and cracks with age.
AN Fitting Ready: Compatible with standard AN hose fittings for clean, leak-free coolant line routing. Allows use of braided stainless or push-lock AN hoses for a professional motorsport appearance.
Compact Design for Swaps: Significantly smaller footprint than the OEM coolant housing, freeing up critical space in tight engine bays — essential for K-swap Miata, Civic, Integra, and custom chassis builds.
Universal K-Series Fitment: Fits all Honda K20 and K24 engines (K20A, K20A2, K20Z1, K20Z3, K24A1, K24A2, K24Z7, etc.) found in RSX, Civic Si, TSX, Accord, CR-V, and Element.
Corrosion-Resistant Anodized Finish: Protects against coolant corrosion and oxidation for long-term reliability in daily-driven and track applications.
Compatibility
Engine
Vehicles
Notes
K20A / K20A2 / K20Z1
2002-2006 Acura RSX / RSX Type-S, 2002-2005 Civic Si (EP3)
Direct fit
K20Z3
2006-2011 Civic Si (FG2/FA5)
Direct fit
K24A1 / K24A2
2002-2006 CR-V, 2004-2008 TSX
Direct fit
K24Z7
2012-2015 Civic Si, 2013-2017 ILX
Verify manifold type
K24A4 / K24A8
2003-2012 Accord, 2003-2011 Element
Direct fit
Specifications
Spec
Detail
Material
6061-T6 Billet Aluminum
Finish
Anodized
Fitting Type
AN (Adapter sold separately or included per listing)
Application
K-Series Engine Swap / Race / Street
Installation
Bolt-On (Reuses OEM Mounting Bolts)
Why Choose iFJF
Engine swaps are hard enough without fighting coolant leaks from old, brittle plastic housings. iFJF K-series adapters are designed by enthusiasts, for enthusiasts — compact enough for the tightest Miata swap, durable enough for track duty, and priced without the inflated markup. Backed by our 30-day satisfaction guarantee.
Frequently Asked Questions
Q: Will this work for a K-swap Miata?
A: Yes. This adapter is specifically designed with tight engine bays in mind. The compact profile clears the Miata firewall far better than the bulky OEM coolant housing, making it a popular choice for K24 and K20 Miata swap builds.
Q: Does this include the AN fittings and hoses?
A: This listing is for the billet aluminum adapter housing itself. AN fittings and hoses are sold separately to allow you to choose the exact size and style that fits your build. Most K-swaps use -6AN or -8AN fittings and hose.
Q: Is this for the coolant passage on the intake side of the head?
A: Yes. This adapter replaces the factory coolant outlet housing located on the intake manifold side of the cylinder head. It is part of the coolant bypass circuit that routes coolant through the intake manifold and throttle body on the factory setup.
Q: Do I need to tune after installing this adapter?
A: No. This adapter only changes the physical coolant routing — it does not affect airflow, fuel delivery, or ECU parameters. No tune adjustment is required.
Q: What gasket do I use with this adapter?
A: You can reuse your existing OEM Honda coolant housing gasket, or use a thin layer of high-temperature RTV silicone (such as HondaBond or Permatex Ultra Grey). Ensure both mating surfaces are clean and flat before assembly.
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