[Gator67]

Today I switched from ported to manifold for vacuum advance (bypassing the TVS switch/port altogether) to see if it would further reduce operating temperature in stop and go traffic. It did. I drove the car around the area for 45 minutes in the middle of the day (108 degrees) with the AC on full blast (temp inside the middle vent read 48 degrees). Lots of lights, stop signs, and some slow climbs. When I got home I pointed the IR temp gun at the thermostat housing while the car idled...it read 199 and stayed there for the next five minutes or so, creeping up to just 202. This is about 8-10 degrees cooler than before I made the change. Of course, with all the driving it could be that the engine is now more broken in. Regardless, the cooling and A/C systems are functioning well now.