• 1958 Pontiac Bonneville • We spotted this stunning example of late-’50s American design at the Barrett-Jackson 2025 Palm Beach Auction. It's powered by a 370ci V8 with a Tri-Power carburetor setup delivering 300 horsepower, thanks to a high-lift camshaft and 10.5:1 compression. The system is matched by it's period-correct Hydramatic automatic transmission. The exterior is finished in classic red and white with a matching interior and a power-operated black soft top. It features original factor

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