I have noticed an antifreeze smell lately. I pulled several plugs on both heads. Every one I have pulled has an orange/ rust color to it. I have had a cracked head before but only one plug was discolored. I don't think both heads are cracked in every cylinder and it is highly unlikely both gaskets are blown. The car runs and drives fine and ran 12.40's last week at the track in 90 degree heat. Any ideas? please help.
HVY SS

 

Some fuel additives will turn the tips of the spark plugs orange. I've seen this with cheap octane boosters.