Rodney-Dude,
AVOID 'car show' idling traffic jams-for lots of reasons. You make junk out of the plugs is one. Your spectacular car is for YOU to enjoy, not the sheep at shows that gawk, show and tell (lies).
If you are stuck in parade-type conditions in a street traffic jam, pop out, and prop the hood back edge (like 3" or more) with a cushion or something to get heat out. Puking a hose is pretty serious and ruins your day. But warp a head............
I won't go there.
Most sincerely,
