ok so i bought a used 12v motor from a wrecked truck. when i pulled the head it turned out it was fire ringed. both the head and block are ringed. my question is, i bought this so i can send the head out to be oringed and p&p and have no down time, now is the oring on the head the same as if i were to just oring it or is it different in a fire ring application. i dont want to have to use the block i bought or have mine sent out to be fire ringed.