This short and straight billet upper neck is machined from 6061 aluminum. It features an o-ring seal to the head, and a -16 orb thread. You can choose either a -16 male adapter fitting, or standard hose barb fitting for a standard radiator hose. New hardware is also included.
NOTE: This does not have a provision for the fan switch. If your engine has a fan switch in this location, you will need to relocate it, or activate the fan another way. Such as by a fan controller, or stand alone ecu.