Just gonna toss it out, for anyone interested. On my 64 Ply, with a 440, and a later 3 core 22" radiator. I'm the one, who ordered and installed one of the 180 SuperStats. With that thermostat installed, a short 5 mile each way drive, damn near burned my engine up! When I got back to the shop, motor was cooking. Temp gun read 220 degrees! The hell with that. Yeah, I tested the thermostat...opened as it should. Before, I had just the thermostat 'plate' in there, to restrict the flow. It worked 'okay'. Jerked that SuperStat out, and went with nothing but the gasket. Temps stay great, now. Even on hot days...though haven't had any days over 100. Temp stays in the white bar range, up towards the higher end, at traffic lights, and such. Rolling again, it cools back down. So, yeah, I'm liking it.