RAM Clutches 433 Performance Pressure Plate is a member of the RAM Clutches Diaphragm Pressure Plate Series. These Diaphragm Pressure Plates are masterfully engineered for Street Performance cars and trucks. These Diaphragm Pressure Plates will provide a substantially increased clamp pressure that is necessary for High Torque Muscle Cars or Crate Motor Street Machines that operate in a lower range of RPMs (Revolutions Per Minutes). These RAM Diaphragm Clutches are approved for Heavy-Duty Street and Limited Competition. For Full Race vehicles, please select RAM Long Style clutches with the Heavy-Duty covers. These are not converted or modified factory-stock pressure plates. Each unit features increased or adjustable static pressure, a ductile iron explosion resistant pressure ring, and is precision balanced to within ó-Ounce/Inches. Over 35 years of racing clutch development and manufacturing assures that the clutch selected will meet expectations. RAM Clutches are the Champions Choice.