Holley's Ultra Street Avenger Carburetors feature all aluminum construction and are equipped with metering blocks and a base plate made from 6061-T6 billet aluminum. A variety of anodized color options allow for a personalized look Each Ultra Street weighs approximately 5 lbs. less than a comparable zinc Ultra Street carburetor. Ultra Street Avenger carburetors have the same great features as their cast aluminum counterpart carburetors such as quick-change vacuum secondaries, four vacuum ports, factory preset ''No Trouble'' electric choke, built-in fuel filters and an included fuel line kit. The Ultra Street Avenger now comes with anodized metering blocks and a base plate made from 6061-T6 billet aluminum with built-in, clear fuel level sight glass for easy fuel level adjustments.