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Its suppose to be a tight press fit but parts have to be made to spec to work>

I have seen the water pump impeller loose on the shaft on a 4.7. It would make heat and stay cool at an idle but as soon as you started to drive it would get hot.

I had the same problem with a high flow thermostat. Swapped it out for a stock type 180 degree stat and it was fine after.

I was using a high flow tstat and found that in cooler weather it was never really closed. Engine took too long to warm up. But any way Dart67 when trying to figure out cooling issues I like to see what the temp of the lower hose is like. This time of year around here the lower hose on my dart...

What temp thermostat are you using? Is it a standard one or high flow?

I had the same problem with my 73 dart. Running around town idling ect was fine. Get out on the highway and put some sustained load and it would get too hot. I had a stock 26" 2 core copper radiator. Replace it with a Griffin 2 core aluminum radiator and a Mrgasket high flow t stat and it barely...

If it gets hot on the highway no fans or shrouds are going to help. You need more radiator.