• The 1970 Pontiac Grand Prix was a hardtop 2-door coupe. This personal luxury car was optionally outfitted with a massive 455-cubic-inch engine, Pontiac's largest, that produced loads of horsepower and torque. Pontiac equipped the Grand Prix with bucket seats, a cockpit-like instrument panel, tuned suspension, and power front disc brakes. A special trim upgrade on the 1970 Grand Prix was the Hurst SSJ, but under 300 models sported it. According to MuscleCarClub.com, this model included a Hurst shifter, sunroof, gold-plated wheels, sport mirrors, whitewalls, and Frost Gold accents.
  
  

Grand Prix Dimensions

• The 1970 Grand Prix was 210.2 inches in length. Its wheelbase was 118 inches, and its curb weight was 3,953 pounds. All Grand Prix models --- the base Grand Prix, Grand Prix J, SJ, and the aftermarket Hurst SSJ --- rode on the same General Motors G-body chassis.
  
  Leg room in the front was 42.4 inches and in the rear, 31.6 inches. Usable trunk space was 15.3 cubic feet.
  
  

Grand Prix Powertrains

• There were three engines available in the 1970 Grand Prix. The first two were versions of Pontiac's 400-cubic-inch V8. These produced either 300 or 350 horsepower.
  
  This Pontiac had the new 455-cubic-inch V8 with a strong 10.25--o 1 compression ratio. It provided 370 hp and 500 pound-feet of torque at 2,700 rpm.
  
  Most Grand Prix buyers chose an automatic transmission, the M40 Turbo Hydra-Matic 400. The sport option was the M21 Muncie four-speed stick shift.
  
  1970 Grand Prix coupes came with the GM 3.23 to 1 differential. Although other axles were available, they were not common choices, according to Hemmings.
  
  

Brakes and Tires

• The 1970 Grand Prix had single-piston front-caliper brakes. Power brakes were optional, but a common choice of buyers.
  
  When new, these cars came with either steel wheels and wheelcovers or five-spoke Rally II wheels. The wheel size was 14 inches.