The LS-4 big-block V8 engine was offered delivering and 15% of the cars were ordered so equipped. “454” emblems adorned the hood of big-block equipped Corvettes. All models featured a new cowl induction domed hood, which pulled air in through a rear hood intake into the engine compartment under full throttle, increasing power (but didn't show up in the horsepower ratings). 0-60 mph times were reduced by a second while keeping the engine compartment cooler. The new tire size was GR70-15 with white stripes or raised white letters optional. An aluminum wheel option was seen on 1973 and 1974 pilot cars, and a few 1973s were so equipped, but withheld for quality issues, and wouldn't be available until 1976.