Holley EFI LS1 Main Harness for HP EFI & Dominator EFI 721075 2020-2023 Chevrolet Silverado 3500 HD

2020-2023 Chevrolet Silverado 3500 HD 98

1/8" NPT compression fittings

needs EEC IV upgrade

Hydration Hole/Plug front and center in Chin Bar with easy set up

Holley EFI LS1 Main Harness for HP EFI & Dominator EFI 721075 2020-2023 Chevrolet Silverado 3500 HDLS1 6 Main Harness for HP EFI and Dominator EFI Holley is quickly becoming The New Standard In EFI! Holley's HP ECU is standard equipment on the 2013 2014 Chevrolet COPO Camaro and Holley's EFI throttle body powers every NASCAR Cup Series team. Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win