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This is a pair of sintered metallic discs for the Tilton OT-II Dual Disc Racing Clutch. The 1 5/32" x 26 spline size has been used on many racing transmissions in larger cars, from XTRAC to Weismann and from March to Lola. The 8-rivet hub attachment is stronger than the more common 6-rivet attachment to handle higher torque levels. Back-to-back hubs require flywheel clearance.
Tilton recommends replacement when the clutch disc friction material wears to 0.089". New discs measure 0.104" thick.