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1970 Buick GS 455
The 1970 Buick GS 455 was the factory big-engine Gran Sport, identified in Buick records as the GS 455 series rather than a dealer or tuner conversion. Source records separate the GS line from the GS 455: Team Buick's model-year table lists GS 455 sport-coupe and convertible production under series 46, while the VIN reference maps series code 46 to GS 455 and body codes 37 and 67 to the two-door hardtop and convertible bodies.
The base GS 455 powertrain was Buick's 455-cubic-inch four-barrel V-8. Hemmings' buyer guide reports the regular 455 at 350 horsepower and 510 lb-ft of torque, with Stage 1 treated as a separate option rather than assumed for every GS 455. The order form shows a standard manual-transmission pathway plus optional Turbo Hydra-Matic 400 and four-speed manual choices, so this page covers the verified transmission choices instead of choosing one unsourced example configuration.
Chassis evidence is similarly option-sensitive. The buyer guide and Buick order/code records support standard hydraulic drum brakes, optional power assist and front discs, optional limited slip, performance axle choices, and the F41 Rallye Ride Control/heavy-duty suspension package. Production is safest at body and engine/transmission dimensions: the production table reports 5,589 non-Stage-1 GS 455 hardtops and 1,184 non-Stage-1 GS 455 convertibles, with manual and automatic sub-breakdowns.
Appearance and interior coverage is conservative. Buick paint-code records provide the regular 1970 passenger-car colors, while GSX-only Saturn Yellow is not treated as a regular GS 455 color. Interior claims are limited to source-backed seating, console, instrumentation, steering, and trim options; unresolved factory trim-code detail remains a coverage gap for follow-up in dealer data books or original trim charts.