Professional Products 7.5 Inch Damper for LS-1/LS-1 Camaro/Firebird features the Powerforce damper for the extremely popular LS1 engine. It represents one of the best values available in the high performance industry. This damper will also work on most LS1 based crate engines. Although not required on a stock engine, the dampers have a keyway and 60 degrees of timing marks. These two dampers are dimensionally identical to the stock O.E. damper.