I imagine that is about the time Clutch-Flites came into the picture and they prone to failures as well. Now with todays clutch technology they might work better
Gus
Ohhhh boy a good buddy of mine blew one of those up at Norwalk in a front engine dragster that only ran 8.90’s. What a mess and there was a lawsuit because of it. It tore his safety blanket up so bad it looked looked like chopped up fiberglass and a piece hit a guy in the stands.