I was there in '74 driving the "Hawiian"... It pushed the valve cover gaskets out just before the finish line [sheet metal covers], and the "thermos jacketed" headers didnt exist yet.. Needless to say, it became a huge inferno.. Just past the finish line, it had already burned off both the chutes, and a little ways further, burned off both the rear tires... The fire bottles barely bought me enough time to get off into the grass just before turn 1 on the Oval, and I bailed out the side window area while the car was still rolling... Thank God for the bulky, non fashionable, 9 layer Tri-Form suit that I was wearing.. It burned off 7 of the 9 layers, in areas I wont mention, but it saved my ASS from any serious burns..
The following year they mandated Cast valve covers, Jacketed headers, and roof hatches, or as "Coil" put it, "Pig Chutes"..
It's amazing to me, what we all got away with in those days, with the safety equipment that we had, AND didnt have....
Denny Savage