Holley Ultra Double Pumper Model 4150 650 CFM4-Barrel Carburetor - 4-Barrel - Square Bore - Electric Choke - Mechanical Secondary - Dual Inlet - Polished / Black 2120012 Ideal for LS-based crate engines

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a balancer that isn't properly attached is not only dangerous but will not do it's job of protecting the crank bearings properly

Holley Ultra Double Pumper Model 4150 650 CFM4-Barrel Carburetor - 4-Barrel - Square Bore - Electric Choke - Mechanical Secondary - Dual Inlet - Polished / Black 2120012 Ideal for LS-based crate enginesHolley Ultra Double Pumper Carburetor 0 76650BK 4 bbl 650 CFM Black Anodized Billet Alum Metering Block Base Plate w Black Hardware Mechanical Secondary Model 4150 Electric Choke Ultra High Strength And Durability Ultra Cool Modernized Looks 4 Corner Idle 4 Vacuum Ports Factory Pre Set Electric Choke Precise Idle Control And Stability Clean Safe Performance Easy To Install And Understand Holley has been the undisputed leader in fuel systems for over