Huh. I didn’t think you could still get a 19”radiator with a v8 in ‘73. That is on the small side. So is the fan, 2050 cfm isn’t terrible, but it’s not what I would want. That combined with the 19” radiator and your cooling system is a bit undersized, makes sense that it would be ok most of the time but fall behind when you up the demand. And you’re running a thermostatic switch that triggers the fan at 180*? So it’s running almost all the time. 180* thermostat too?
Just for reference, the Ford contour electric fans I run are ~3,500 cfm on low speed, and around 5,000 cfm on high.
