i just installed a 180 high flow mr gasket thermostat and i also have high flow pump and high flow march pully system. started car and let it idle for 1/2 never went above 140, i thought the guage was wrong so i changed it out and same thing 140, drove around pretty hard for about a hr never went above 160 and that was when i was in 5th gear, dropped back down to 4th 140 again temp outside was 87 degrees.
Upper hose felt pretty hot, passengers side of radiator felt cooler then drivers side
Not complaining but i thought the temp should rise to at least 180 or above for the thermostat to open?
car has summit aluminum radiator, and stock sb shroud with flex fan half way in the shroud and water wetter, guage is mechanical