Hays performance throwout bearings are designed to withstand high spring pressures and high RPM conditions common to performance clutches. They are heat treated and Blanchard ground to ensure trueness. The ball bearing race is packed with heat resistant moly-based grease for better lubrication and longer life. This throwout bearing has a 1.375 in shaft diameter and 2.607 in face diameter. This bearing will fit most GM applications. Other applications available.