Buick Gran Sport specs: 1973-1975

Buick Gran Sport specs: 1975-1977

The Buick Gran Sport nameplate lived on as the performance version of the colonnade Century. Surprisingly as an upscale Century, it did not get the formal roof like the Luxus and Century Custom, but got the fastback styling of the base Century, which still looks great. The car, like all Smog-Era specials, was watered down but the big block Buick V8 was still offered through 1974. Checking off the GS option group in 1973 & 1974 would net you: Rallye suspension including a rear sway bar, blacked out trim, ‘Gran Sport’ logos. Also included were GR70 tires, oil pressure gauge and coolant temperature gauge. Optionally, the GS cars were allowed to receive the Stage-1 455 or dual exhaust on the 350 V8 that no other Century was allowed to get. In 1974 the rear bumpers were changed out to the Federally-mandated 5 mph unit. Things got worse in 1975, as the Gran Sport morphed into a black-out, performance gauge, and sway bar package, with big blocks being dropped and a V6 now being the base engine.


Platform: A-body

Trim Levels:

  • base
  • Stage-1
  • Body Styles:

  • fastback coupe
  • fastback sun coupe
  • Wheelbase: 112.0″

    F/R Track Width: 61.5″/60.7″

    Overall Length: 209.5″

    Overall Width: 79.0″

    Overall Height: 53.7″

    Turning Circle: not published

    Drag Coefficient: not published

    Curb Weight: 3650-3900 lbs.

    Available Engines:

  • 231 CID 2bbl V6 (1975 only)
  • 350 CID 2bbl V8 (1973-1975)
  • 350 CID 4bbl single exhaust V8 (1973-1975)
  • 350 CID 4bbl dual exhaust V8 (1973-1974)
  • 455 CID 2bbl V8 (1974 only)
  • 455 CID 4bbl V8 (1973-1974)
  • 455 CID 4bbl Stage-1 V8 (1973-1974)
  • Available Transmissions:

  • 3-SPEED MUNCIE M13 MANUAL (1973-1974 all, 1975 V6 only)
  • 4-SPEED MUNCIE M20 MANUAL (1973 only, all)
  • 3-SPEED TH350 AUTOMATIC (1973-1975 231/350 cars)
  • 3-SPEED TH400 AUTOMATIC (1973-1974 455 cars)
  • Axle Ratio:

  • 2.73
  • 3.08
  • 3.23
  • 3.42
  • Fuel Capacity: 22.0 Gallons

    Fuel Economy: not published

    Head Room F/R: 37.7″/37.0″

    Leg Room F/R: 42.5″/33.7″

    Shoulder Room F/R: 59.6″/57.1″

    Hip Room F/R: 54.9″/52.7″

    Tires: GR70-15

    Wheels: 15.0″ x 6.0″

    Production Totals:

  • 1973- approximately 6600 units including 728 with Stage-1 option
  • 1974- approximately 3355 units including 478 with Stage-1 option
  • 1975- unknown for the ‘tape stripe’ year
  • buick-gran-sport-1974

    This is a quickly modified factory photo of a ’73 model to illustrate the differences outer appearance on the 1975 Gran Sport. These include, larger grille, rectangular signals, different bumpers, lack of ‘Gran Sport’ logo on quarter panels, and a higher location for the side markers.

    Leave a comment