1958 Pontiac Bonneville Convertible Tri-Power engine was a 370-cid, 255-hp V-8 History Of The Pontiac Bonneville became its own line in 1958, having been promoted from a performance upgrade on the 1957 Star Chief. The 1958 Bonneville was built on the same chassis, but as a true performance model. With this model being a candidate for the first true Pontiac muscle car, Bonneville buyers got a lot of power for their money. The base engine was a 370-cid, 255-hp V-8 with a Carter four-barrel carbure

Tri-Power drop-top! This 1958 Pontiac Bonneville convertible is powered by a 370ci V8 engine with a Tri-Power carburetor setup rated at 300hp. It's ready to find its next home at the 2025 Palm Beach Auction, April 24-26 at the South Florida Fairgrounds. Learn more: bit.ly/PB25FB-1958PontiacBonnevilleConvertible | Barrett-Jackson

This 1957 Pontiac Bonneville convertible is one of 630 produced in the model year. Powered by a Rochester fuel-injected 347ci V8 engine backed by an automatic transmission, this highly detailed convertible received a professional restoration to factory specifications more than 12 years ago, which included lacquer paint and numerous NOS parts, such as a marble steering wheel and deluxe spinner hubcaps. Offered from the Cars from Dreams Collection and selling with No Reserve at our 2022 Palm Beach