• Holley 4150-style 850-cfm four-barrel carburetor
• Features show-car-quality polished finish
• Mechanical secondaries
• Electric choke
• Four-corner idle adjustment
• Power valve blowout protection
• Custom-calibrated for the zz572/620 crate engine
• Recommended for 502 crate engines and suitable for Big-Block engines, including street, competition, towing and off-road vehicles
• Bolts and gaskets included
• Replaces Holley 4160 850-cfm carburetor #12366996

Note: Carburetor can only be recalibrated for use with other large-displacement engines.