What makes it special: Buick’s Gran Sport name has been used on several high-performance cars built since 1965. In the GM brands hierarchy, Buick was surpassed in luxury and comfort appointments only by Cadillac, which did not produce performance models. As a result, the Buick GS series were the most opulently equipped GM sport models of their era.
The 400 was replaced for 1970 with the , used in the . The base model was rated at 350 bhp. The Stage 1 engine option used cylinder heads that, while using raw castings of the same pattern as all of the other Buick 455’s sharing the same model year, were machined differently in order to accept larger valves, and to produce smaller compression chambers for increased static compression ratio. The option also included a more aggressive camshaft, a specially tuned 4-barrel Quadra-Jet carburetor, more aggressive ignition timing, 5/8 inch oil pickup tube and a higher numerical final drive, and was available with either Turbo-Hydramatic 400 3-speed automatic transmission, or a Muncie M-22 4-speed manual transmission.
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