1963 Impala Z11 from the Bob Marvin Collection at “The Shed” in Warroad, MN.
Just prior to GM announcing its ban on factory racing in early 1963, the Z11 program was destined to become an option of legendary status.
Z11-equipped Impalas numbered a mere 50 units, and featured many weight reducing components and deletions. For instance, the radio and front sway bar were history. Since it was to be a race car, items like sound deadener, a radio, and a heater were also left on the assembly line. Only the small, round stalk shifter and Delco electric tachometer were standard. Front end components were made of aluminum, including the hood, fenders, front and rear bumpers, brackets and braces, grille brackets, a two-piece fan shroud, the grille filler panel and hood support catch replaced standard production steel parts. With these, the car tipped the scales at nearly three hundred pounds less than an equivalent 409-powered production line Impala.
The highlight of the option was the highest-performing W-series engine ever released – the 430HP 409 cubic-inch engine. This particular engine was exclusive to the Z11, and featured dual four-barrel carburetors, unique heads and camshaft, a 13.5:1 compression ratio, an all-forged reciprocating assembly, and a very special cowl induction “cold air” system
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