I always fill the engine from the upper radiator hose until it is full before connecting it to the radiator. No air pockets, like other have said seems to be your problem. Was there a particular reason you changed the factory thermostat (don't know what the temp of it is) to the 180 one?
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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