Ed,

 

            Jim and I both ran thermostats, plugs up.  Summer or winter, No problem.  Burping the block was mandatory.

 

NeilK

 

 

“snip”

 

I have tried using a thermostat on two occasions and almost fired my engine on the ground.  I am not certain but because I am plugs up, I think I may trap some air around the thermostat stopping it from heating up and opening