Radium Fuel Rails - GM LS7 EngineHigh flow fuel rails engineered by Radium Engineering for the GM LS7 engine. CNC machined from billet aluminum with large bore internal passages, these fuel rails deliver superior fuel distribution and support high horsepower applications while maintaining a direct bolt on fitment. Compatibility GM LS7 engine Key Features CNC machined billet aluminum construction Large bore internal passages for superior fuel flow Direct bolt on installation using OEM