TracTuff P72 Filler Neck
Whether you have added a radiator that does not have a fill point or you are just in need of a higher fill point to aid in burping the sometimes troublesome cooling system, the filler neck for the P72 (B18C1) cylinder head is an entry-level product that gets it done.
The filler neck starts with a beautifully machined 6061-T6 flange that incorporates incorporates a 3D tapered exit port for a seamless transition to 1.25" tubing and an o-ring grove on the backside for a positive seal against the cylinder head without the hassle of Hondabond. Extra effort was made to notch and weld a bent filler tube so that it clears the upper mounting hole. Choose between standard hose (1.25" OD) or -16 male flare.
NOTE: Made to Order - Contact for ETA - If you are interested in a specific design that varies from this, please email us at firstname.lastname@example.org. The cap bung has a 1/16" NPT port for connection to an overflow and uses early model Honda radiator caps; such as an 88'-91' Civic/ CRX or 90'-93' Integra. If you are using AN lines, I 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 neck includes two stainless M6 socket head bolts and an o-ring. The filler is welded so that it sits level when bolted to an engine leaned forward 5.5° (exhaust side).