1970 Oldsmobile Cutlass SX 455 Sport Coupe

Description

The 1970 Cutlass SX was Oldsmobile's compact-sized performance package, positioned just below the 4-4-2 on the same A-body platform. Its defining feature was the 455ci Rocket V8, a large-displacement engine chosen for broad, usable torque. In SX trim it carried a two-barrel carburetor and a low-restriction exhaust with 442-style trumpets, rated at 320hp with substantial low-end pull.

The drivetrain favored durability and everyday drivability. A Turbo Hydra-Matic automatic was standard, sending power to the rear wheels through a 12-bolt axle.

Chassis tuning was conservative but competent. Front disc brakes were available, and suspension upgrades improved body control over a standard Cutlass. The relatively light coupe body gave the SX a favorable power-to-weight ratio for its era.

Overall, the SX struck a measured balance of performance and comfort. It was less aggressive than the 4-4-2 yet delivered strong acceleration, straightforward mechanicals, and the refinement Oldsmobile buyers expected.

This 1970 Oldsmobile Holiday Sport Coupe is one of a reported 6,404 built with the Cutlass SX performance package for the model year. It has been freshly repainted in the original color to address fading in areas and finished with a ceramic coating.

This 1970 Oldsmobile Cutlass SX 455 Holiday Sport Coupe is now offered with a clean Florida title in the seller’s name.

Highlights

• Finished in Burnished Gold Iridescent (58)

• Saddle-colored vinyl bucket-seat interior (979)

• 455 cubic-inch Rocket V8 with 2-bbl carburetor

• 3-speed Turbo-Hydramatic 400 automatic

• 12-bolt rear axle with 2.56:1 gearing

Factory Equipment

• 2-door Holiday Sport Coupe (pillarless hardtop)

• Power steering

• Power brakes

• Front disc brakes

• Air conditioning

• Remote mirrors

• SX identification badging

• The chassis number (342570Z107363) decodes as:

  • 3 – Oldsmobile division

  • 42 – Cutlass S series

  • 57 – Two-door sport coupe (pillared body)

  • 0 – 1970 model year

  • Z – Fremont, California, assembly plant

  • 107363 – Sequential production number

Known Imperfections

• Paint imperfections as shown in the gallery

• Some wear on interior surfaces

Ownership History

The seller acquired this 1970 Oldsmobile Cutlass SX 455 in 2018.

Included Items

• Build sheet

• Warranty booklet

• Various service documents