{"product_id":"hybrid-racing-rbc-rwd-coolant-port-adapter-k20z3-k24a-k24z","title":"Hybrid Racing RBC RWD Coolant Port Adapter - K20Z3 \/ K24A \/ K24Z","description":"\u003cp\u003eAnyone who's put a K-series into a rear-wheel-drive chassis knows the problem: the firewall is right there. The standard coolant housing exits out the side of the head, and in a tight RWD bay that's exactly the wrong direction. This adapter fixes it by routing the coolant outlet straight off the back of the cylinder head instead, which is a much smarter path when you're fighting for every millimeter behind the motor. It's compact, it's machined from a single piece of 6061, and it turns a packaging headache into a clean, sensible cooling layout.\u003c\/p\u003e\n\u003ch4\u003eRead This First: Manifold Compatibility\u003c\/h4\u003e\n\u003cp\u003eThis is the most important thing on the page, so don't skip it. Because the coolant outlet exits from the rear of the cylinder head, this adapter is not compatible with standard transverse K-series intake manifolds, and that includes the factory PRB, RBC, and RRC manifolds. There simply isn't clearance behind the head with those manifolds in place.\u003c\/p\u003e\n\u003cp\u003eThis is built for use with rear-wheel-drive-specific intake manifolds that leave room behind the cylinder head. So confirm what manifold you're running, or planning to run, before you order. If you're still on a factory transverse manifold, this isn't your adapter yet, and if your RWD build is running the standard side-exit setup, our FWD RBC coolant housing adapter is the one you want.\u003c\/p\u003e\n\u003ch4\u003eBuilt For Tight RWD Engine Bays\u003c\/h4\u003e\n\u003cp\u003eThe rear-exit design is the whole reason this part exists. In an S2000, a BRZ, a BMW, or any other RWD chassis taking a K-series, the space between the back of the head and the firewall is at a premium, and a side-exit housing eats into it while forcing your hoses on an awkward detour. Pulling the outlet straight off the back gives you a shorter, more direct path to the radiator and frees up room you genuinely need for everything else back there. It's a smaller footprint doing a better job, which is exactly what a tight swap calls for.\u003c\/p\u003e\n\u003ch4\u003eKeep Your Heater Or Do A Clean Heater Delete\u003c\/h4\u003e\n\u003cp\u003eYou get both options in the box, so you decide with the parts in hand rather than at checkout.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKeeping the heater?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUse the supplied threaded fitting and your heater core stays connected. If the car sees street duty or cold weather, go this route.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoing a heater delete?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCap it with the included -8 ORB plug and move on. Fewer hoses, less clutter, one less thing to leak in a bay where space is already tight. That's usually the call on a dedicated track or race build.\u003c\/p\u003e\n\u003ch4\u003eRun Factory Hoses Or Go Full AN\u003c\/h4\u003e\n\u003cp\u003eThe outlet is a threaded -16 ORB. Thread in the included -16 ORB to hose barb fitting and you're running conventional radiator hoses. Or run a\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.hybrid-racing.com\/products\/hybrid-racing-16an-to-16orb-fitting-universal?_pos=1\u0026amp;_sid=9625acf76\u0026amp;_ss=r\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e-16AN fitting\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e(sold separately) if you're plumbing the whole cooling system in AN line, which a lot of RWD swap builds end up doing anyway. Either way you're not locked in, and you're not buying a second housing when the build evolves.\u003c\/p\u003e\n\u003ch4\u003eMachined For Flow, Not Just For Packaging\u003c\/h4\u003e\n\u003cp\u003eThe internal coolant passage is fully machined rather than left as-cast, so coolant moves through smoothly without unnecessary turbulence or restriction. That's the part that separates a well-made adapter from one that just looks the part. You get the compact rear-exit packaging and you keep proper flow, along with OEM-quality sealing, which matters a lot on a swap where you don't want to be chasing a coolant leak behind the engine.\u003c\/p\u003e\n\u003ch4\u003eWhat's In The Kit\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBillet coolant port adapter\u003c\/li\u003e\n\u003cli\u003eStamped steel gasket\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003cli\u003e-8 ORB plug (for heater delete)\u003c\/li\u003e\n\u003cli\u003eThreaded heater hose fitting (to retain the heater)\u003c\/li\u003e\n\u003cli\u003e-16 ORB to hose barb radiator fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Hybrid Racing","offers":[{"title":"Default Title","offer_id":44919071375453,"sku":"HYB-CPA-01-05","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1151\/0688\/files\/Hybrid-Racing-RBC-RWD-Coolant-Port-Adapter-K20Z3-K24A-K24Z-1.jpg?v=1787252456","url":"https:\/\/jhpusa.com\/products\/hybrid-racing-rbc-rwd-coolant-port-adapter-k20z3-k24a-k24z","provider":"JHPUSA","version":"1.0","type":"link"}