I made the base plate from a piece of 1/4" x 3" flat stock. I turned the water outlet from a 1 1/2" x 1 1/4" steel threaded pipe reducer. I bored the threads out of the inside, but left a step inside. I put a step down in outside of the tube also so I could get the bolt heads to clear. I have those 2 pieces welded together. I need to add a tab to one corner that is used to locate the alternator. Then I will flatten up the plate on the grinder a bit then it is to the surfacing machine to make sure it is flat and will seal.
More questions!
My stock outlet has 2 water temperature probes. Are these used? Why measure temperature on the inlet to the motor? I would think you want to measure the temp at the outlet of the motor, or in the head.
I see some inlets have water ports. What are these used for?
My real question is do I need to install threaded inserts in the tube for anything. I left enough room that I can put in at least 1. I will have to check for clearance before welding them in. Has to clear the ac, alternator, motor mount, and who knows what else.