return hose from the radiator isn't collapsing, is it? make sure you've got one of those spiral spring inserts in the hose to hold it open.
do you have an aftermarket overflow bottle? i saw one of those once that was plumbed as a radiator bypass ( 2 nipples on alum overflow bottle, one hose ran to the rad pressure side hose, other hose ran to the rad return line ). on a race car.
is the radiator cap higher than the engine? you need to have A cap ( not necessarily the radiator cap ) at the high point of the cooling system. otherwise it makes it almost impossible not to have an air trap in the lines which will significantly interfere with cooling.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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