I had been corresponding with one of the SN Elders about doing this. He had been very kind to share his knowledge and experience with me and I would just like to say that Edbert rocks. Later, it dawned on me to contact Meziere and get the lowdown. I talked with Mike Meziere who told me you can send the pump back and they will tap it and fit it with a fitting on the outlet side of your choice so you can run a hose to your heater core for the bargain basement price of $30. You then run a return line to a low pressure port on your manifold. If you cannot send it back, say because you are in europe and the Euro tax nazis will hose you, Meziere will send specs and detailed instructions to you so a machine shop can do it for you. Ta da. Great company. I wish I could buy more stuff from them.