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hey Jeff,
thanks for posting the installation info. I'm reconsidering if I even want to install the heat riser valve. I know it's more accurate but my T/A is never driven in cold weather so maybe I should just seal up area where the heat riser is installed.
What's the best way to seal, nut and bolt or weld? Any susggestons?



karl,

i was in the same boat as you are now. I'm not concerned about being correct, and since i allready had the valley pan without the heat ports the decision for me was easy. i just got a stainless bolt/nut and copper washers (hardware store), it's been about a year and no leaks/issues at all, plus i could just change the nut bolt at any time.
You could also consider installing the external thermostat and just leave the "flap" inside out, or cut it out, that way it would appear stock, but not work.