Adapts LS1 LS6 LT1 EV1 Injector Harness to LQ4, LQ9 4.8 5.3 6.0 Delphi Injectors Quantity 8 Engine Harness End : EV1 connector Fuel Injector End :Delphi connector Use these adapters to connect the Delphi LQ4, LQ9 4.8 5.3 6.0 (Truck Engines) fuel injectors to a EV1 style LS1 LS6 & LT1 Based engine harness. LQ4 Express/GMC Savana Silverado 2500 Pickup, 3500 Pickup, Crew Cab, and Chassis Cab/GMC Sierra 2500 HD Pickup and Crew Cab, C3, Denali, and 3500 Pickup and Chassis Cab, 1500HD Crew Cab Suburban/GMC Yukon XL Denali Hummer H2 SUT GMC Yukon Denali LQ9 2002–2006 Cadillac Escalade 2003–2007 Silverado SS 2004–2005 Silverado and GMC Sierra Vortec HO Edition Only 2005-2006 GMC Sierra Denali Pickup and Yukon Denali 2006–2007 Classic Silverado and GMC Sierra VortecMAX Option