Drained all the coolant, including the block drains , flushed it good with garden hose both running and not. Was super clean with no signs of crud ever Installed a Stant super stat 180 temp thermostat in it ( it had a 160 in it I removed ) Refilled with distilled water and a bottle of Rislone cooling system additive, Put a spring inside the lower hose
With a thermometer in the top of the radiator it shows approx 195 - 200 with the gauge showing slightly over half way.
For the most part it changed nothing other than it warms up quicker
I can hold my hand in front of the radiator and I feel it should be pulling more air thru it. I have no problem changing to a smaller diam upper pulley but at $150 or up . I would be pissed it it changes nothing.
I have heard good reviews of the milodon high flow water pump . There is room for a larger diam fan blade but finding one thats direct drive is not easy. and wonder about blade pitch if it would help or not
