Description Essentially an OEM replacement upper water neck for the K24A, K24A2, K24A4, K24A8, K20Z3, and K20Z4. The billet K series water neck flange eliminates the bulky OEM piece with its huge heater core fitting and EGR provision. The RBB/ RBC water neck assembly starts with a beautifully machined 6061-T6 aluminum flange that incorporates the largest port possible within the OEM gasket’s footprint. A 1.25″ angled tube that mimics the OEM outlet position is welded to the flange. A 1/2″ NPT heater port is standard regardless of whether you plan on using it. The hardware kit includes four M8 socket head bolts, a 90° heater hose fitting, a 1/2″ NPT plug, and a pair of o-rings. The outlet tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM option) or leaned forward 8° (Gangster Lean engine mount option). NOTE: The 1/8″ NPT Accessory Bung option shown below was originally offered for those looking to retain the IACV coolant loop. It is a FEED and should not be used as a return. Fitting not included.
