Designed for small-block and small displacement big-block engines, these carbs are recommended only for stock to Performer level applications. They are not recommended for use on RPM or Torker II intake manifolds. Match with an Edelbrock Performer or Performer EPS manifold and other brands of similar design. Calibrated 2% leaner than #1405. Includes both timed and full vacuum ports for ignition advance. Comes with: Metering Jets - Primary .098, Secondary .095; Metering Rods - .075 x .047; Step-Up Spring - yellow (4" Hg). Edelbrock Performer Series Carb 1406 600 CFM - Square Flange - Electric Choke - w/o EGR - Includes Primary Jet-.098 - Secondary Jet-.095 - Metering Rd-.075x.047 - Dual Plane Intake - Street/Hi Performance UsageBurnished AluminumGM/AMC-Style Throttle LinkageElectric Choke Installed from FactoryEasy Tuning with 2-Piece DesignSmooth Secondary TransitionBoth Timed and Full Vacuum PortsIncludes PCV OutletPit Stop USAoffers Edelbrock Performer Series Carb 1406 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Fuel System and Intake Parts and Accessories, Edelbrock Carburetors, Edelbrock Gasoline Carburetors, Edelbrock Carburetors, Edelbrock Performer Carburetors.