1969 Buick GS400 Concours Restoration Guide

The 1969 Buick GS 400 is the year the Gran Sport story reached a new level with the debut of the Stage 1 performance package. Stage 1 brought a revised camshaft, higher-flow cylinder heads, free-flowing exhaust manifolds, and a revised carburetor — all working together to produce 345 hp (official rating, likely conservative). Combined with the standard GS 400's 340 hp, the 1969 GS 400 lineup offered two genuine high-performance configurations. A Turbo-Hydra-Matic 350 automatic was available in addition to the manual options.