I will have to check the cap. It is a bugger to access and take off.
We are getting +/-20F drop across the radiator, with the electric fans on, sitting at idle. It varies, but it always pretty close to 20F drop. If the numbers matter, 178F up top and 158F on the bottom. That is read on the tanks, as the nipples are covered by the radiator hose(s).
The hottest point in the whole system seems to be the thermostat housing. It is a pretty solid 220-230F there. Moving over inches (as in 3-4") to the radiator line, it drops 40-50F, which seems odd, but I checked it a number of times to confirm.
The radiator is coolest, right between the fans, dead center in both directions. It reads 120F there, rather steady.
Attached is an older photograph of the setup we are running. Fabricated here on the farm, not the least bit stock. The stock radiator, while thicker from front to back, by about 1.5 times, is nearly the same size in all other dimensions. That radiator is beyond repair, or so we have been told, but we have it in case we run into someone that wants to rework it on the cheap. The stock setup did NOT have electric fans and relied entirely on air from the roof scoop, which is why we are puzzled with it running hot, WITH the fans.
