4-new top quality #180 throttle blades for Holley 830-1000 cfm model 4150 & 4160 4 barrel carburetors. also fit similar AED, Avenger, BG, Demon, Grant, QFT, Street Avenger carburetors using 1-3/4" diameter throttle blades. please see our store listings for machined high flow throttle blades & screws, and a huge selection of Holley performance parts.