Holley Spreadbore And Quadrajet

If you're tired of tuning on your old Quadrajet™ with lackluster results but don't want to go to a standard intake manifold like everyone else, Holley has you covered. Our QJet Sniper EFI system delivers that signature roar when the secondaries open while improving drivability, efficiency, and economy.

Thanks to the dual pattern design of the squarebore Sniper EFI systems, you have tons of options even if you're using the less popular spreadbore or Quadrajet style intake manifolds.

If you're making up to 500 horsepower and want to maintain that classic Quadrajet look and sound, the Sniper EFI Quadrajet is perfect for you. While four 100 lb/hr injectors are standard like the base Sniper EFI system, the smaller primary throttle bores required us to scale back fueling in them to ensure proper fuel balancing between all four throttle bores. This is why the Quadrajet Sniper EFI is limited to 500 horsepower, whereas the standard Sniper EFI system is good for up to 650 horsepower.