What heater core ? I am concerned about racing w/o water temp knowledge! Since I have my entry maybe I puta bring the Lexus out for a run! Rich would like that LOL..
What I was saying is run the temp sensor in the outer hole. Plug the inner hole. And block off the water outlet on the water pump.
remove one off the iron water plugs/draincocks on the side of the engine block and use a bronze adapter !!!! or a electrical sending unit with EL guage...
It's done. I built a Tee set-up woth brass fittings off the front hole and plugged the one by the dizzy. Not pretty but I will dress it up with AN fittings later. Thanks for all the input!