TracTuff PRB/ PRC Filler Neck - V3
An inexpensive solution for all you K20A, K20A2, K20A3, K20Z1, and K24A1 engine owners looking to 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 k series cooling system, we've got you covered.
The filler neck starts with a beautifully machined 6061-T6 flange that incorporates the largest port possible within the OEM gaskets footprint, a 1/2" NPT water bypass port, and machined o-ring groove for the OEM gasket. You can choose to add a sensor port directly to the top of the flange (near the logo) or the side of the flange (under the outlet) as well as choose to have the outlet come out of either of the two large 1.25" ports; making the product universal for both FWD and RWD applications.
The outlet coming out the side (Configuration 1 Shown) would be typical for FWD applications but flipping the filler tube to the other port could also lend itself will to FWD applications with center feed and passenger side inlet plenums. RWD applications should only order Configuration 2 if you have at least 2.50" clearance as measured from the cylinder heads M10 threaded boss to the firewall for the filler tube. If you do not have this clearance, I recommend the RWD K Swap Filler Neck.
The hardware kit includes two M6 stainless steel socket head bolts, a water bypass hose fitting, and a Genuine Honda gasket. The filler tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM option) or leaned forward 8° (Gangster Lean engine mount option).
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. 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.
DISCLAIMER: Configuration 1 may have clearance issues with throttle cable pulley and/ or fuel rail plumbing; you will need 4.00" of space directly in front of the cylinder head as measured from the water neck mounting surface. The centerline of the filler tube sits at approximately 3.00" and comes straight up and occupies a portion of the fuel rails inlet/ outlet path. I strongly recommend a center feed fuel rail so the driver side port can be plugged. Intake manifold injector placement and injector dimensions can improve or complicate the situation so I encourage you to communicate your situation or simply choose an alternative product such as V1 Filler Neck.