Procomp Adjustable Metering Blocks

Procomp fully adjustable metering blocks allows you to stay in complete control of your carbs fuel delivery.Improved throttle response over stock, fully tunable for street and strip applications. Retains vaccum passage for distributor vaccum advance. Calibration upgrade without sacrificing street vaccum provisions. Direct Holley replacement, fits all 4150 and 4160 carbs.