Musclecar clutch sets are an affordable upgrade from a stock replacement unit, most popular for restoration applications where a slightly better unit is required. Musclecar sets include a higher clamp load pressure plate along with a premium quality 5 or 6 spring double spring hub organic disc. The higher clamp load addresses the higher torque produced by many earlier muscle cars and yet retains a very smooth engagement for low speed driving and cruising. These sets are also ideal for mild bolt on cars that will only see street driving. Sets include pressure plate, clutch disc, release bearing, and alignment tool unless otherwise noted. 10.5 x 1 1/8-26 spline GM. Diaphragm. 6 spring hub. For applications up to 450 hp. Includes pressure plate, clutch disc, release bearing, alignment tool. Clutches, Flywheels and release bearings are STRICTLY FACTORY WARRANTY ONLY. Customer must return the unit to RAM for evaluation and inspection. For a full list of warranty information please see our warranty information here