Aftermarket Chevrolet and Pontiac machined flywheels are .140" thick and built to handle even the toughest applications. Constructed from the same A514 Blanchard ground steel and neutral balanced with 168-tooth (Chevy) and 166-tooth (Pontiac) starter rings. These machined flywheels are designed for specific application engines. These machined flexplates are a "must have" for moderate to serious performance applications.