Hey all, I am running a sbc350 with 11.4:1 compression. It has been driven on the road only a few times. Currently, it has the acclaimed NastyZ28 $90 Carquest aluminum radiator, stock 78' thermostat, and radiator cap. I believe it is an "open" cooling system, since there is a coolant overflow tank on the passenger side, and the cap of that reservoir has a vent hole. Car runs 160-180 at idle, but just a short drive later it will jump to 220 (the beginning of the "red" on the U14 gauges). Temp sender is on driver side. Temp sender is new. I have a few questions about the fundamentals of cooling systems and how they pertain to my application: 1.) What is a "closed/pressurized" and what is an "open" system? Does opening the radiator cap to "burp" the system of air bubble matter if this is an "open" system? Are our cars considered to have an "open" system? 2.) My current thermostat is original to my '78 305 so it goes without saying that it could afford to be replaced. I see conflicting information in these threads about whether to run a 160 or 180 or 195 (stock?) thermostat- what do I purchase? 3.) Follow up to question 2... What is my optimal operating temp? I pulled over and shut it off @ 220, but should I not be worried? It was not "puking fluid". 4.) What PSI radiator cap should I be running, and does it matter? 5.) If 220 is too hot, what is my plan of action? Burping the system? Thermostat? Taurus fan?