C4 Corvette ZR1 Billet Steel Flywheel

When replacing the original dual mass flywheel on the c4 corvette, you must match balance the new solid flywheel to the original dual mass flywheel removed from the car as the original is finely tuned to each individual motor beyong the factory balancing. On the engine side of the dual mass flywheel you will see approximately 30 1/8 inch holes around the outer perimeter next to the ring gear. if any of these holes are filled in the flywheel factory balancing has been altered for your specific engine. Usually if only 1-2 holes have been filled no further balancing is required but if more than 2 holes are filled it is highly recommended the new solid flywheel be matched balanced to the original dual mass to avoid any vibrations thru certain rpm ranges after the installation is complete. Most machine shops that do engine work will have the ability to match balance the 2 flywheels. If you have any questions pertaining to this proceedure please feel free to give us a call.