Page 4 of Hays Performance Clutches & Flywheels 2008 by Prestolite Performance

street clutches diaphragm pressure plates display box packaged an excellent upgrade from the stock unit the street clutch far exceeds oe specifications in material construction and performance light pedal pressure and quick release make this diaphragm clutch the most popular choice for today s street driven vehicles available for most gm and specific ford applications diameter 10 10.5 10.5 11 11 applic at i o n ford passenger car general motors ford passenger car general motors ford truck hydraulic pa rtno 51-120 51-105 51-125 51-110 51-140 s tat icpressure 1500 2300 1900 51-110 borg beck pressure plates display box packaged one of the earliest clutch designs but still among the most popular the hays borg beck three finger street clutches utilize 12 heavy-duty coil springs to exert maximum pressure on the disc these pressure plates are assembled without roller assist to minimize pedal pressure at high rpm recommended as a street performance replacement for amc general motors and mopar applications that are equipped with a borg beck style clutch diameter 10.5 11 applic at i o n gm mopar amc gm mopar amc gm mopar amc pa rtno 50-105 50-110 50-120 s tat icpressure 2400 2400 2500 50-105 12 long-style pressure plates display box packaged long-style clutches are primarily used in ford powered vehicles the hays long-style street clutch with its familiar triangular shape utilizes nine heavy-duty coil springs behind the pressure ring to provide the ultimate grip and thrust for most street enthusiast applications designed as a direct fit replacement and performance upgrade for ford and mercury vehicles diameter 10.5 11 52-105 applic at i o n ford mercury ford mercury pa rtno 52-105 52-110 s tat icpressure 2100 2100 street discs display box packaged hays street clutch discs are designed to provide clean smooth engagement and provide a significant performance increase without sacrificing streetability these discs feature organic friction material that is riveted to a marcel backing and a sprung center hub to absorb driveline torque eliminating shock and vibration to ensure chatter-free engagement marcel a crimped plate between the friction materials that acts as a shock absorber 55-111 diameter 10 10.5 10.5 10.5 10.5 spline 1-1/16-10 1-23 1-1/16-10 1-1/8-10 1-1/8-26 pa rtno 55-102 55-104 55-107 55-111 55-121 diameter 11 11 11 11 12 spline 1-1/16-10 1-23 1-1/8-10 1-1/8-26 1-1/8-10 pa rtno 55-108 55-205 55-212 55-221 55-310 tech tip tech tip 2 q what is static pressure a static pressure refers to the amount of base pressure in pounds exerted to the pressure ring by the internal springs when the clutch is engaged q what is centrifugal or roller assist a certain hays pressure plates feature centrifugal assist for increasing pressure plate load to prevent slipping and high rpm plate/disc separation the borg beck design utilizes rollers inside the cover that are forced to the outside under centrifugal force to increase plate load as rpm increase certain long-style pressure plates use levers that have extra weights on the levers to provide centrifugal assist.

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