I just switched back to a manual valve for my headers so i have some stuff laying around. I have an electric solenoid that works excellent for turning on and off the water to your headers. Wire a switch on your dash to send 12-volts to it and voila! water out the pipes.
The solenoid was given to me and so i'm giving it away to the first person to stop by OC Auto Shop and pick it up. I took the plumbing out of my boat so you can have the braided lines and fittings for the headers too. i dont get online much these days so dont pm me because you can stop by the shop and grab it faster than i'll be able to respond.
the address is 25652 Taladro Circle, Unit H, Mission Viejo, CA 92691
Ask for Brian mon-friday 830am to 5pm. 949-581-3330
I"ll leave the stuff with him.
Happy boating.