Honda K Series Thermostat Housing

How much do you hate the plastic OEM housings found on almost all k series engines? Maybe you've had a cracked housing... or worse, a stripped M6 insert that kept you from being able to remove your thermostat cover! 

This Genuine Honda thermostat housing for the Acura RDX fits all first-gen k series water pump housings; however, depending on which housing this is replacing, it may change the bolt pattern for the cover. If you are currently using the K20A, K20A2, K20Z1 style housing and cover... the cover will no longer work. If you are using a housing and cover from pretty much any other k series the pattern will be the same.

If you own my billet cover or you are considering buying one, you must select the "All Others Mod" so that it works with the bolt spacing found on this housing.

You may also notice that this housing has a very tall metal tube; that is your new water bypass connection. Not only is it tall, it's also 3mm larger in diameter! The nipple on the plastic housing measures 17mm, and this one measures 20mm. You will need to buy a reducer joint , or you can try to stretch the smaller hose over the larger nipple.

NOTE: I stock these in limited quantities. If the product goes back order, it will delay your order for up to a week. The hardware kit includes three Genuine Honda M6 bolts and the matching gasket.