1958 Chevy Impala

Chevrolet Impala was introduced for the 1958 model year as top of the line Bel Air hardtops and convertibles. From the windshield pillar rearward, the 1958 Bel Air Impala differed structurally from the lower-priced Chevrolet models. Hardtops had a slightly shorter greenhouse and longer rear deck. The wheelbase of the Impala was longer than the lower priced models, although the overall length was identical. Interiors held a two-spoke steering wheel and color-keyed door panels with brushed aluminum trim. No other series included a convertible.

The 1958 Impalas had three taillights each side, while lesser models had two and wagons just one. The Impalas included crossed-flag insignias above the side moldings, as well as bright rocker moldings and dummy rear-fender scoops.

The standard perimeter-type frame was abandoned, replaced by a unit with rails laid out in the form of an elongated “X.” Chevrolet claimed that the new frame offered increased torsional rigidity and allowed for a lower placement of the passenger compartment. This was a transitional step between traditional construction and the later fully unitized body/chassis, the body structure was strengthened in the rocker panels and firewall.

A coil spring suspension replaced the previous year’s rear leaf springs, and an air ride system was optional.

A 283 cu in (4,640 cc) engine was the standard V8, with ratings that ranged from 185 hp (138 kW) to 230 hp (170 kW). Equipped with optional Rochester Ramjet fuel injection, power output increased to 250 hp (190 kW). Two versions of Chevrolet’s first-ever big-block V8 were optional; the 348 cu in (5,700 cc) in single four-barrel form producing 250 hp (190 kW), or topped with three 2-barrel carburetors, increasing output to 280 hp (210 kW).