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when the Z11 debuted inward belatedly 1962, it was a dichotomy of firsts inwards improver to lasts for Chevrolet's drag racing efforts. It was the terminal of the full-size lightweights, give cheers y'all lot to GM's 1963 self-imposed anti-racing edict, inwards improver to it ran the terminal W-headed race engine, exactly it was the get-go to possess the magic cubic-inch displacement - 427. Built inward iii batches, the initial 25 Z11 Impalas were released on December 1, 1962. The get-go machine arrived at Ammon R. Smith Chevrolet inward York, Pennsylvania, nigh Christmas 1962, for the already highly successful team of Strickler inwards improver to Jenkins, who had get-go met at a nearby drag strip years before. Under the hood was a revised W-series engine. The stroke was increased from the 409 past times times .150-inch using a forged-steel 3.65-inch stroke crank to construct it a 427, land the bore remained at 4.3125 inches. Forged connecting rods were employed, i...