Really? 212F at sea level, thats 100C for our Canadian friends. Any antifreeze/coolant will raise the boiling point. Hot motors run great, its when the coolant boils out and leaves you nothing is when you get into pinging. An all iron motor is pretty hearty when it comes to heat, just don't add water to a scalding motor. Let it sit for an hour. Cracked a Cleveland head doing that and I knew exactly when it happened! Glurg glurg glurg...CRACK! F.......not the end of the world, they were $35 a piece off all the 400Ms in the bone yard back then.
