Mine held up about 2-3 yrs. with 20-30 passes at the strip and some G-tech runs and some street races. That was before I had my B&M shift kit and TCI 2500 stall converter. I think the shift kit helps longevity with the firmer shifts. When my C-4 went out it was the high gear clutches that went. The trans just slipped after I shifted to 3rd at WOT. As I said , I believe the harder shifts allow less slippage there so that these clutches will hopefully last a little longer. I do have a guy that will rebuild the C-4 for me for $200 with me doing all the removal / installation work.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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