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  • TracTuff RBB/ RBC Filler Neck - V1.2


    An alternative to the OEM angle filler neck which has become a popular request on transverse mounted mid-engine applications such as the MR2 and NSX as well as FWD applications with wild sidewinder turbo manifolds with large frame turbos.

    Starts with a billet flange, your choice of import or domestic radiator cap bung, either standard hose connection or -16 male flare, welded to an outlet that can range from 60° to 90° (shown). The flange includes a 1/2" NPT heater port. 

    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 (shown) 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 sales@tractuff.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 billet neck has a 1/2" NPT heater port and the hardware kit includes a 90° hose fitting and a plug in the event you don't plan on connecting a heater hose. The filler is welded so that it sits level when bolted to an engine leaned back 15° (exhaust side) for the traditional option and leaned forward 8° (intake side) for the gangster lean mount option.