Two other high-performance 389s were offered, including a four-barrel version rated at 333 hp (248 kW) and a 348 hp (260 kW) Tri-Power. Tri-Power carburation (with three two-barrels) raised output to 318 hp (237 kW). The standard engine was the Bonneville's 303 hp (226 kW) 389 cu in (6.4 L) V8, which came with four-barrel carburetor and dual exhausts. The listed retail price before optional equipment was $3,490 ($33,764 in 2022 dollars ) and was the most expensive model when it was introduced. Included were a padded instrument panel, deluxe steering wheel, courtesy lights, and other features. The rear bench seat included a center fold-down armrest and a speaker grille that could be made functional with the extra-cost Bi-Phonic rear speaker. It was given a distinctive grille and taillights unique to the Grand Prix, and replaced the Pontiac Ventura while the Catalina was still available with the 'Ventura' trim package for 1962. It used the Catalina coupe platform with minimal outside chrome trim, and was installed with the 303 hp (226 kW) 'Trophy' version of 389 cu in (6.4 L) V8 engine with a 3-speed manual transmission or optional console-mounted 4-speed manual or Hydra-Matic automatic, and was equipped to the luxury standards available on the longer, top-line Bonneville coupe.

It was also installed with a center console with a transmission shifter, tachometer, 4-barrel carburetor, dual exhausts, and 'acceleration' rear axle ratio (3.42:1). The Grand Prix was an all-new model for Pontiac in the 1962 model year as a performance-oriented grand tourer coupe with bucket seats upholstered in ' Morrokide' vinyl, while nylon loop-blend carpeting covered the floor and lower door panels. South Gate Assembly, South Gate, California

Gas tank for 1971 pontiac grand prix