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.
Variant 2 works with engines that do not have a distributor or an Engine Position Module. The filler neck starts with a beautifully machined 6061-T6 flange that 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 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 info@vk-garage.com or If you have questions related to the configuration or options. 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 an EPM and need the filler moved... please send an email or if you use a distributor, please look at V1.
