Late Chevy Balanced (Externally Balanced, One-Piece Rear Main Seal) - Button Flywheel for V-Drive, Pro-Series, & Optimum-V 7.25" Clutch Unit These Button-Style Flywheels from Quarter MasterĀ® are engineered for use with rear mount bellhousings and flexplate assemblies. They are designed and manufactured in-house, using stringent quality control methods to ensure excellent product performance and availability. Late Chevy externally balanced, one-piece rear main seal. For V-Drive and Pro-Series. 7.25" Clutch Unit. Use with rear mount bellhousings and flexplate assemblies. To be used with a neutral balanced or no flex plate. Note: This is for use with Race applications only - not intended for Street use. Tech Tip:When installing a new clutch, be sure to follow the manufacturer's instructions for correct set-up. You should also replace the pilot bushing/bearing. Tech Tip: To extend the life of your expensive racing clutch you should not use it to load the car on or in your trailer. The amount of slippage this causes is worse than a night of racing.