The Bonneville was all new for 1958, with completely redesigned bodywork on a Cadillac-based cruciform frame, and a hardtop version joined the convertible in Pontiac showrooms. Coil springs replaced the old semi-elliptical units in the rear for an improved ride, and a shorter platform offered improved handling, which the Bonneville took advantage of with a new 370 cubic inch 4-barrel engine packing 10:1 compression and 285 horsepower with the 4-speed Hydra-Matic.
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