HI,<br />I am purchasing a set of used over the transom water injected headers for my 460 jet boat.<br /><br />I am reading the manufactures website and I don't understand the installation instructions, or rather, I don't understand why to do it this way.<br /><br />there are 2 water outlets on the thermostat housing, and it says to run a "T" fitting of one of them, and run a line of each side of the T into each header. simple enough. This is where I get confused though: Off of the other water outlet, run that to a plumbers "gate" valve, and then continue the line overboard as a discharge line. The purpose of the gate valve is so you can control at what RPM the water is injected into the headers, if the valve is wide open, water is injected at 3000RPM, if the vavle is 1/3 open, injection is at 1500RPM. <br />How does this valve control at what RPM water is injected into the headers when there is a direct line to the headers off of the other thermostat outlet?<br />thanks,<br />Josh
