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.
All billet parts are CNC machined from US milled 6061 aluminum. The domestic cap bung has a 1/8" NPT port and the import version has a 1/16" NPT for connection to an overflow. The domestic version uses any early model (late 70's Chevy C10 Pickup w/ 454) cap and the import version uses early model Honda (88'-91' Civic/ CRX and 90'-93' Integra) cap.
NOTE: Made to Order - Contact for ETA - 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 filler is welded so that it sits level when bolted to an engine leaned forward 5.5° (exhaust side).