TracTuff PR3 Filler Neck
The PR3 (B16A/ B16B/ B18C/ B18C5) cylinder head filler neck helps simplify your cooling system, whether you have added a radiator that does not have a radiator cap bung or you are just in need of a higher fill point to aid in burping the sometimes troublesome cooling system.
The filler neck starts with a beautifully machined 6061-T6 flange that incorporates incorporates a 3D tapered entry port for a seamless transition to 1.25" tubing. The backside of the flange has an o-ring grove for a positive seal without the hassle of Hondabond. The fill tube is bent to clear the distributor and comes up high enough to allow for easy filling. The outlet can be configured for 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 email@example.com. If you have questions related to the configuration or options... PLEASE visit the WHATS WHAT or FAQ page. 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). If you have deleted the distributor, I can make a different filler tube, something like the GSR version.