Any help appreciated.....302 Windsor, new 3 core radiator, thermostat, water pump, new hoses (lower anti collapse) timing spot on.....around town ok, but open road it gets to 3/4 and pushes water out......(55mph)....we about to recheck head gasket, but that was the first thing to be replaced as well as lifters....
What's it in, electric fan? Serpentine belt conversion? Could be something as simple as the wrong radiator cap or the spring in the old one is worn out. It'd also help to know the actual temp, I'm assuming that 3/4 is the temp gauge. If you stepped up the heat range on the stat, it might be something as simple as the cap, but I'd expect the problem more on around town driving since there's less air flowing through the radiator than on the open road.
First thing I would do was carry out a block test .
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