I just bought the chrome waterneck you see on the 'bay, and it has no provision for a Thermostat! I will not run without a stat, so I'm gonna chuck it up in my 4 jaw on the lathe and turn a recess to accept one. I don't know how much a machine shop would charge, but if anyone in socal want it done I'll do it for just a coupla bucks ( to cover the 1/2 hour or so it'll take)!