Perf Street Sprung Disc by ACT 3000902 is a performance street disc and the most popular disc purchased. It features premium organic materials with high copper content for better heat transfer. Performance street discs allow for quicker shifting and smooth engagement. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. ACT spring-centered assemblies use bushings and cone springs similar to factory clutch discs. This creates frictional dampening, which improves clutch life and reduces noise. Quiet operation with increased strength and reliability. Smooth engagement, quicker shifts, OE to mild gear rattle; Premium organic composite friction blended for high heat tolerance, increased burst strength, faster recovery from overheating and less wear of mating surfaces; Spring retainers feature heat-treated wraparound spring windows that provide support and reduce stress concentrations that are common causes for failure; Recommended for street and race use; Steel-backed Features Input Spline Quantity: 10 Input Shaft Diameter: 1.125 in. Disc Diameter (in): 10.512 in. Disc Diameter (mm): 267mm Disc Material: Organic Disc Style: Full face Hub Style: Sprung Benefits Smooth engagement, quicker shifts, OE to mild gear rattle Premium organic composite friction blended for high heat tolerance, increased burst strength, faster recovery from overheating and less wear of mating surfaces Spring retainers feature heat-treated wraparound spring windows that provide support and reduce stress concentrations that are common causes for failure Steel-backed linings for higher burst strength, reduced marcel for quicker shifts Applications 1973-1979 Buick Regal 1967-1982 Pontiac Firebird 1979-1979 Pontiac Phoenix 1955-1975 Chevrolet Bel Air 1968-1979 Chevrolet El Camino What\’s In The Box? 1 – ACT Perf Street Sprung Disc Warranty ACT 1-Year Limited Warranty