For 1959 Chevrolet again came up with a totally new car with all new sheet metal, a new frame, and even new series names. The fourth generation Bel Air resembled nothing else on the road. The Bel Air, which had been the top line series since 1953, was now the middle range. Under the hood, little change took place. A variety of speed options, such as fuel injection, special cams and lowered compression, gave horsepower ratings up to 315. Little change was made for 1960. However, fuel injection was no longer available, but with the 348 cubic inch engine, a horsepower rating of 335 at 5800 rpm was now achieved. The fourth generation of Bel Air was built until 1960, and it was replaced by the Fifth Generation Chevrolet Bel Air.