Designed and calibrated for optimum street performance in high-horsepower small-block and big-block engines. Match with a variety of manifolds that include Edelbrock Performer, Performer RPM, RPM Air-Gap, Torker II and others of a similar design. Includes the following: Metering Jets - Primary .113, Secondary .101; Metering Rods - .068 x .047; Step-Up Spring - Orange (5" Hg). Edelbrock Thunder Series AVS Carb 1812 New - 800 CFM - Square Flange - Manual Choke - w/o EGR - Primary Jet-.113/Secondary Jet-.101 - Metering Rd - Dual/Sml Sngl Plane Intke - Street/Hi Performance UsageNew Qwik-Tune Adjustable Secondary Air ValveOptional Single Or Dual Fuel InletDistinctive Black Accented HardwareNo Gaskets Below Fuel Level to Prevent LeakageMetering Rod/Step Up Springs Can Be Changed EasilyGM/AMC-Style Throttle LinkageExclusive 12 Month Complete Satisfaction WarrantyPit Stop USAoffers Edelbrock Thunder Series AVS Carb 1812 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 Thunder Series AVS Carburetors.