Our Ultra Series aluminum flywheels have some key advantages over stock and other aftermarket units. Machining tolerances are extremely important when making a flywheel. Eccentricity, parallelism, and the step height (which is critical to proper clutch break-in and engagement) are kept to within .0015”, the most accurate in the industry! Dowel pins are hardened steel units and all hardware is grade 8 (grade 10.9 metric equivalent), the highest grade of fastener available today. Torque plates are also included in applications where required and flywheels are checked for zero-balance before shipping.