TracTuff Extreme Clearance K Water Neck Kit - AN
EXTREME CLEARANCE!!! Yup, that's what you get with this kit. Geared specifically towards (but not limited to) the "Front Engine Rear Wheel Drive" market and those situations where the rear of the RBB/ RBC cylinder head is buried into the firewall.
The outlet on the K24A, K24A2, and K20Z3 sits over the transmission and I've seen that this creates trouble in several situations and as the popularity of the k swap grows, I fully expect that this scenario will also. The four bolt block-off measures 11/16" thick and takes less space than the traditional K20 cam sensor or an 1/8" more than the K24 cam sensor giving you the MAXIMUM clearance possible. The flange uniquely merges the original water outlet with the traditionally unused EGR passage on RBB and RBC cylinder heads, sending water to the intake manifold flange surface, where a hybrid water bypass adapter re-merges the EGR port with the enlarged original water bypass port to achieve a level of flow that allows this unique water bypass to serve as an outlet.
I highly recommend the purchase of the M5 Drill and Tap Kit to support the standard upper link... here is "How to" drill the cylinder head for the "optional" M5 retaining bolt. The hardware kit includes installation hardware and o-rings (not shown) for the block-off and the water bypass outlet.
I do not and will not sell either component of this kit separately as they are only meant to work together.
NOTE: This product can only be used with the RBB/ RBC cylinder heads or similar heads that don't have an EGR passage that connects to the intake port.
It is MADATORY that you open up the cylinder heads original water bypass port using the supplied guide/ template to increase water flow. The original passage combined with the EGR passage is not enough. The cylinder bypass port MUST be enlarged. DO NOT buy this product is you are not prepared or capable of performing this task. The original .500" water bypass hole does not provide enough flow. The guide/ template can be cut out out and used to scribe a line in the heads surface, allowing you to transfer the shape of the passage, giving you lines to stay within as you grind. The .500" hole can easily be opened up to .830" x .920" at the widest points (approximately) to increase flow... enough to be combined with the .750" EGR passage and serve as the new outlet.
If you are using AN lines, it is IMPERATIVE that you designing the upper radiator hose so that there is droop/ give in the hose so the engines movement does not push/ pull on water bypass outlet; the upper link and/ or link and small M5 bolt combo should not be under stress. I cannot stress this enough... and it’s even more critical in a FWD environment due to the short hose run!
The block-off does NOT have a heater outlet (remember... you don't have room for it) so you will need to find another outlet elsewhere on the block.