For 1958, all-new styling at every General Motors passenger-car division ushered in big changes, just as the corporation was celebrating its 50th anniversary. It was also the final year with Harley Earl at the helm of GM design. Though the new models were longer and lower in proportion than in previous years, Earl’s signature use of excessive chrome remained unabated. That brightwork continued a trend that had dominated automotive design throughout the Fifties. For 1958, it worked seamlessly with those new designs that presented a broad departure from previous years.
Currently listed on Hemmings Auctions are a pair of faithfully restored hardtop coupes from the GM catalog from that momentous year. With wide chrome grilles surrounding four headlamps and copious brightwork including side trim the length of the body, this 1958 Chevrolet Impala Sport Coupe and 1958 Pontiac Bonneville Sport Coupe both handsomely display the heavily Earl-influenced styling that made headlines for GM.
1958 Pontiac Bonneville Sport Coupe
While GM made general announcements and events around its 50th anniversary for 1958, only Pontiac incorporated the occasion into its advertising. It mattered little that the first Pontiac rolled off the assembly line in 1926 as sub-brand of Oakland. Laid out in large letters in its brochure, Pontiac’s advertising theme for 1958 carried the tagline “The boldest advance in fifty years,” also declaring “A new kind of cars is born!” Previously introduced as a well-optioned convertible version of the Star Chief in 1957, the standalone Bonneville arrived for 1958.
Promising “the first true union of sport car action with town car luxury,” the Bonneville was only produced as a pillarless hardtop Sport Coupe or a drop-top Sport Convertible for 1958. As “a modern ultimate for the man who loves cars…this steel-muscled road machine,” the Bonneville featured a 370-cu.in. V8 engine with a four-barrel carburetor and 10:1 compression as standard equipment. An optional Tri-Power setup with triple two-barrel carburetors was given the “Tempest 395” moniker for its 395 lb-ft torque rating.
As the late 1950s was peak Jet Age, aeronautical and rocket themes pervade the details of the Bonneville. The leading edge of the scalloped rear quarter panels featured a very rocket-like piece of chrome trim that extended to a point at the front of the car. On top of each front fender, just before the headlamps, sat additional chrome-plated pieces that resembled delta-wing jets with appendages that lead into creases atop the fenders like contrails from jet engines.
Finished in Burma Green with Calypso Green accents, this 1958 Bonneville Sport Coupe, one of 9,144 produced, appears to have been restored some years ago, with a fit and finish that looks to be holding up. It is equipped with the Tri-Power 370 and a four-speed Super Hydra-Matic transmission. It is additionally fitted with power windows and power brakes, along with the rare Trans-Portable radio unit that can be removed and used as a portable radio with its built-in speaker and ability to run off batteries. The seller notes no problems with the drivetrain and asserts that the transmission shifts well.
1958 Chevrolet Impala Sport Coupe
Chevrolet didn’t revel in the golden jubilee news that Pontiac touted, but its advertising in 1958 suggested that its redesigned models were “Almost too new to be true!” The ad copy also promised that “You’ll like being looked at in your beautiful ’58 Chevrolet.” Longer, lower and wider than the famous “Tri-Five” models that preceded it, the Chevrolet models somewhat mirrored what was going on at Pontiac, but with a rear-end treatment that seemed to show the previous year’s tall tailfins flopped over somewhat. In magazines ads, the words accompanying the first-year Impala Sport Coupe suggested “This sleek styles-setter promises action, gaiety, glamor—and it keeps its promises beautifully.”
Like the Bonneville nameplate, the first Chevrolet to wear the Impala badge arrived in 1958. Chevy also introduced its first big-block V8, the so-called “W” engine. For 1958, Chevrolet dubbed this 348-cu.in. engine the Turbo-Thrust V8 when equipped with a four-barrel carburetor and Super Turbo-Thrust when fitted with Tri-Power triple carburetion. Though it lacked the aviation/space themes of the Bonneville’s styling, the similarly proportioned Impala was also festooned with plenty of brightwork, from the wide grille to side spears that ran nearly from the taillights to the headlamps. Pound-for-pound, the massive wraparound bumpers probably contained the highest amount of chrome on the car.
Finished in Onyx Black with a bold Rio Red-dominated interior, this 1958 Chevrolet Impala Sport Coupe now on Hemmings Auctions features a long-term restoration that spanned the 1990s. Completed in 2001, it appears to be holding up well. The photos of the very clean undercarriage that accompany the listing tell a story that the car has been taken care since that redo. This example is fitted with the four-barrel 348 that was rated at 250 horsepower when new. Power reaches the rear axle via a two-speed Powerglide automatic transmission.
GM made some distinct design changes for 1958. With plenty of models across five passenger-car divisions, we are fortunate to have options in the collector car hobby when it comes to these chrome-laden machines. Which of these ’58 hardtop coupes would you like to cruise in?
Head on over to Hemmings Auctions to take a look and let us know.
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