Puk'in Fluid

Timing set to 12* initial w/32* max.
Removed thermostat with same results (as above).
No old freeze plugs in water jacket area.
Both top & bottom hoses are getting hot as it warms up and radiator has heat too.
Temp gun shows warm-up as normal then it flashes to 212*-215* after 8-10 min.
What am I missing?

BCP