Make sure you have a thermostat and that it is a good one.
Believe it or not but the absence of a thermostat will cause overheating because the coolant flow is too fast and does not remove the heat from the engine as well.
'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton
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