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TracTuff J Series Through Valley Exit Water Neck

$479.95 $459.95

UPDATE: 4/3/24 The front cylinder heads four bolt flange has been redesigned to reduce machine cycle time and cost. The result is a 2pc. part that I will photograph as soon as time permits. Please enjoy the new lower price!!

The J Series engine has been finding its way into a number of rear wheel drive swaps and I've seen some real creative solutions to make the engine fit up against the firewall; some were convoluted and others looked like they would hurt water flow so I decided to jump in and take a stab at it! 

By far the most complicated water neck set I have made to date. The two bolt neck had to be taller than the four bolt neck (due to the offset cylinder heads) so the two would would be in-line. Further complicating things, the flanges had to have an offset water passage that is slightly higher than the original cylinder head outlet ports in order for the flanges to clear protrusions/ features on the block.

In order to make the combo as compact as possible the four bolt flange had to go over the camshaft thrust cover and being the OEM camshaft thrust cover is tall, a more compact version needed to be made to reduce the height of both water neck flanges while maintaining 1.00" internal passages. The low profile camshaft thrust cover (.1712" tall) was essential to hitting the overall height. You only need of 2.10" of space between the firewall and the water necks mounting surface to run these!

The four bolt flange uses an OEM gasket (Not Included), incorporates an early M12 x 1.5 J Series ECT sensor port, a 1/8" NPT accessory port, and has a -16 ORB outlet. The ORB outlet will not be used in this configuration so the hardware kit will include a plug. The two bolt flange uses an o-ring (included) to seal against the cylinder head and incorporates a -8 ORB outlet port; the hardware kit includes a custom -8 ORB to 5/8" hose fitting and plug so you can choose whether or not to connect a heater core. You have the choice of adding an accessory bung to feed the thermostat water bypass port if you plan on running an inline thermostat.

NOTE: Made to Order - Contact for ETA - If you are interested in a specific design that varies from this, please email us at These unique flanges do not have the means to hold the water pump inlet tube like the V1 flanges do, so you will need to run the J Series Water Pump Inlet or come up with your own solution. The TractTuff J Series RWD Water Pump Inlet shown in the photos below, is NOT INCLUDED.

Photo Courtesy of Levworks_S2j_build - S2000 J Series Swap Hasport Mounts and InlinePro Adapter