those engines don't run any cooling shrouds, they don't run long enough to get that hot. well, unless you run the 1/4 mile.. it takes hp to move air, the faster it turns the more it takes. it gives ya faster throttle response also
the JR dragsters run alcohol which keeps them nice and cool but all those racers are under 18yrs old, i think the older fellas are afraid of becoming Alcoholics......