UntitledHaynes Weber Carburetor Manual 40 Dcnf - Now we get into aspects of carburetor performance which are transient or harder to quantify. We move away from the known setting of Wide Open Throttle to gas mileage and throttle response. In highway cruising at legal speeds in most of our vehicles, the throttle is mostly closed.. The Ford Cortina is a car that was built by Ford of Britain in various guises from 1962 to 1982, and was the United Kingdom's best-selling car of the 1970s. The Cortina was produced in five generations (Mark I through to Mark V, although officially the last one was only the.