TracTuff RBB/ RBC Rear Wheel Drive K Swap Filler Neck

$322.95

The RWD K swap filler neck is a substantial upgrade from the entry-level RWD upper water neck with a bleeder, and the new offset filler tube has improved firewall clearance for several applications!

In their native chassis, the K series has been known for its difficulty in bleeding the cooling system. Now rotate the motor 90° and tilt it back to the OEM position, and you have yourself a dilemma. When you create a connection to the radiator where the hose dives down under the intake manifold and reemerges at the water neck, you create a spot for air to accumulate. I take the opportunity to make this the highest point in the cooling system, which significantly reduces the headache of filling the system. If space or budget allow, look into my RWD swirl pot for increased cooling system efficiency.

My filler necks start with a billet flange that has been CNC machined in the USA using US-milled and certified 6061-T6 aluminum. The flange started life with a -16 ORB outlet port that has been opened up slightly to receive the 1.25" outlet and filler tube. The flange also has a 1/2" NPT heater out port.

The hardware kit includes four M8 socket head bolts, a 90° heater hose fitting, a 1/2" NPT plug, an EGR passage plug, and a pair of o-rings. The filler tube is welded so it sits level when bolted to an engine leaned back 15°.

NOTE: Made to Order - Contact for ETA - If you have selected "Other" for intake manifold, please send an email with your order number and manifold type. If you are interested in a specific design that varies from this, please email us at sales@tractuff.com. The fixture used to make these allows me to reproduce the S2000 outlet position for all but the Skunk2 manifolds. The position will be slightly lower to avoid the intake manifold's features.

The cap bung has a 1/16" NPT port for connection to an overflow and uses early-model Honda radiator caps, such as those found on an 88'-91' Civic/ CRX or 90'-93' Integra.