Power brakes with front disc brake calipers were now standard on all '73 Cutlasses. Additional new features were an acoustical double-panel roof, tighter-fitting glass, flush style outside door handles, molded full foam front and rear seat construction, flow-through power ventilation system, inside hood release, refined Delcotron generator and sealed side-terminal battery, a larger 22 gallon fuel tank, and "flush and dry" rocker panels introduced first on the redesigned 1971 full-size GM cars. Another structural improvement was a stronger design for the side door guard beams. Options included swiveling Strato-bucket seats (with console) for coupes, a power moonroof, and Turbine I urethane (backed by steel) wheels, as was the instrument gauge cluster. The Oldsmobile Cutlass (including the Hurst/Olds and 442) changed body styles to the "Colonnade" body style, which was used until 1977. The Hurst Olds was based on the semi-fastback Cutlass S coupe and featured an interior with swiveling Strato bucket seats separated by a console with Hurst Dual-Gate shifter for the Turbo Hydra-matic 400 transmission. The sole engine offering was a 455 cubic-inch Rocket V8, with four-barrel carburetor and dual exhausts, with the L75 U code engine. Also available was the L77 V code 455 with available only without air conditioning. Although Pontiac's SD 455 cubic-inch engine lasted one more year with , Oldsmobile's high performance 455 engine would only last one more year culminating with the L76 optioned 455 W-30 Hurst/Olds in 1974. The '73 model was the first Hurst Olds to be offered in two color schemes-black/gold or white/gold. A grand total of 1,097 Hurst/Olds were produced for 1973 with about 60% being white/gold and about 40% being black/gold under option code W-45, unless ordered without air conditioning, which was option code W-46. Hurst-only options included a console mounted digital tachometer, air shocks, and alarm system. 1974 The Hurst/Olds returned in 1974 with the "Colonnade" body style. This year the Hurst/Olds was also the Indianapolis 500 pace car, which was available as a graphics package option to the Hurst/Olds owner. 1800 1974 Hurst/Olds' were produced in 1974, 380 of them were the W-30 version which designated the 455 cubic-inch Rocket V8 and produced 230 net horsepower. The other 1420 had a 350 cubic-inch Rocket V8 with , which was also the only engine available for California cars. The 1974 Hurst/Olds was intended to be a pace car but because the Indy 500 track required convertibles for the