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Could it be an air bubble
I try to vent the highest point on my engine water passage.
on small block chevy's i usually break the seal on the thermostat housing and lift thermostat. when filling for the first time to avoid an air bubble.
If its a head gasket I think you should see combustion gases coming out of your radiator with the fill cap off.
I would do a compression check and check for gases b4. I got crazy and started taking things apart.
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