1970 Buick GS455 455 Stage 1 V8 Engine

Buick's Gran Sport name became synonymous with high performance power as soon as it started production in 1965 with its 400ci V8, which was the largest engine permitted by General Motors. In 1970 the power increased even further with the addition of the Grand Sports big block 455ci V8 producing the most torque of any American production car of its era! The Stage I Performance Option bought you a high output 455ci with ram air cold air induction, ported heads with larger intake/exhaust valves, aggressive high lift camshaft, stiffer valve spring & damper assemblies, high volume fuel pump, rejetted Rochester carburetor, special built TH400 automatic transmission (if equipped), heavy duty radiator, low restriction dual exhaust, and performance axle ratio with positive traction. Publicized as having 360 horsepower, most felt Buick clearly unrated its true output.