The FTI Performance 9.5-inch Street Racer torque converter for Ford C4 applications uses a 26-spline input and 11 7/16" bolt circle with a 4000 rpm hard-hit stall for aggressive launches. It is configured for street racer use where a higher stall speed is needed to match powerbands. The explicit spline and bolt-circle details ensure correct mechanical fitment for compatible C4 transmissions.
FTI 9.5in Ford C4 Street Racer Series Converters - 26 Spline - 11 7/16 BC 4000 Hard Hit Stall