With the Pantera, the best thing you can do to help servicing the radiator is to put a drain-cock valve in one of the radiator tanks to replace the factory vent which doesn't work. As you fill the system you simply bleed air from the radiator with that drain-cock. To get the air out of the engine, elevate the front of the car for a minute or two after the engine has reached operating temp and the thermostat has opened up. Any air in the block or heads will migrate to the front of the engine and pass out via the thermostat as it does in any 351C equipped car. The air that passes out of the engine will collect in the "system tank" or find its way to the radiator.[/QUOTE]
I do have a drain-cock in my new radiator specifically for that purpose. I have been able to get a fair bit of air out of it, yet the problem still persists ( air in the system and I think vapour lock from steam) I may not have raised the front high enough to allow the air out of the block as you mention so that plus a new thermostat will be my next option. We'll see
