1" to 7/8" Clutch Slave Swap
A common practice on Superformance Cobras has been to use a 7/8" slave on Small Block cars with an OEM bellhousing and a 1" slave cylinder on engines with a blow proof bellhousing. One issue this causes is that when combined with the Superformance factory supplied 7/8" master cylinder, the 1" slave has less stroke. To remidy this some owners have opted for a larger 1" master cylinder. This project achieves the same results by replacing the 1" slave cylinder with a 7/8" slave cylinder.
Original 1" slave
7/8" bore x 1.25" stroke slave. Part # 91025605 from speedwaymotors .com The push rod and mounting block are custom fabricated.
The Speedway slave does not include a snap ring to prevent the piston from blowing out the end of the cylinder if it is not adjusted properly. If you want the safety of a snap ring the same part is available from McLeod Racing, part # 139006, but the McLeod piece is more than twice the cost and the stroke is reduced to 1.1" to aqcomidate the snap ring. The McLeod unit also includes a push rod, but it is not sutable for this particular instalation.
7/8" slave installed. The two highest 1/2-13 bellhousing bolts shown in the original install photo now attach the 7/8" shave mounting block
After install, adjusting pedal to allow about 1-1/8" travel provided best action
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