TRX400EX TRX 400EX Head Cylinder 87 mil Big Bore Kit Cover Top End Rebuild. FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS. New after-market cylinder head – NO VALVES OR SPRINGS HEAD ONLY. Aftermarket cylinder head valve cover. 87mm after-market big bore cylinder. Wiseco JE or CP forged piston. Head works with all OEM or after market components. Piston uses pump or race gas. Works with stock or after-market valve springs. Everything is brand new. DO YOU NEED TO HAVE THIS ITEM INSTALLED ON YOUR VEHICLE? WE HAVE YOU COVERED! We are BPRATV, offering you the best in parts and service for over 20 years. PRICES AND LISTINGS ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE. Interchangeable part: We stock the same parts from different manufacturers so that when back orders occur, we have a part that is equal in quality and cost to send, preventing what can sometimes be long waits. This would be the only reason your order might vary slightly from the description, and the part that is subbed will always be comparable quality. If you only want a specific brand, just ask and we will let you know if it is out of stock and for how long. Once a part has been installed or prepped for installation it is no longer eligible for return. Over 99% of people in the world are not qualified to build an engine, and it is the responsibility of the person assembling and tuning the engine to make sure all the parts are correct and work properly. We ALWAYS STRONGLY recommend work be done by a qualified, experienced mechanic. Please work with us and we will ALWAYS work with you. No other parts nor any labor are included. We are BPRATV, and we offer a huge selection of Titanium fasteners. Once an item has been used or prepped for use with lubricants, sealant, etc. It is not eligible for return.