This gasket kit, made by Hardin Marine is used with Small Block Chevy Lightning Headers, or Over Transom Headers such as Bassett or Rewarder Headers. When replacing the gaskets on these applications you'll need this and a standard Small Block Chevy Exhaust Gasket, so we created a kit package that includes all four gaskets. These are high quality original equipment style gaskets die cut to exacting size and shape for the perfect fit every time.