TracTuff P72 Billet Water Neck Assembly w/ Fill Port
Okay B18C1 engine owners... you asked, I deliberated, and finally answered! Here is my water neck with cooling system fill point.
It all starts with our beautifully machined flange that incorporates a 3D tapered entry port for a seamless transition to your choice of hose connection. The backside of the flange has an o-ring grove for a positive seal without the hassle of Hondabond. The fill tube has a bend at the base to clear the upper bolt hole and comes up high enough to allow for easy filling.
1. Billet water neck with bead rolled 1-1/4" aluminum tube so you can attach your OEM rubber/ silicone hose - Shown
2. Billet water neck with 1-3/8" aluminum tube for a seamless transition to our -16 male bung - Not Shown
All billet parts are CNC machined from US milled 6061 aluminum. The radiator cap bung uses the larger domestic style cap for the largest opening and huge selection of cap offerings.
NOTE: If you are interested in a specific design that varies from this, please email us at email@example.com. If using AN lines we also recommend designing the upper radiator hose so that there is droop/ give so the engines movement and does not push/ pull on the radiator and fatigue any parts. The fill tube is welded so that it sits level when bolted to an engine with a 5.5° lean forward (exhaust side). Common customization includes variations in hose connection end position and radiator cap bung overflow port clocking.