1970 Oldsmobile Mid-Size Cars Fact Sheet

Rallye 350s were painted in Sebring Yellow with urethane-coated bumpers. Also included were special black and orange decals, blacked out grille and yellow-painted 7″ wide Super Stock II wheels without trim rings, G70×14″ blackwall tires. The engine was the L74 350 CID 310 HP V-8 engine with OAI. Required options were the OAI hood, dual exhaust with 442-style outlets, 3.23:1 axle, heavy-duty suspension, sports mirrors and a sports steering wheel. See the  Brochure HERE.

The Cutlass Supreme SX option was available on  the Cutlass Supreme notchback coupe and Convertible. It consisted of a standard Cutlass Supreme model with a 455 CID V-8 and dual exhausts utilizing the 442 rear bumper outlets. HD suspension was optional, as was most of the 442 equipment, but NOT the OAI hood. In February of 1970 the 455 CID 365 HP 442 engine would replace the 320 HP 2-barrel version. See the SX Option sell sheet HERE.

The Olds Cutlass and 442 were available with the Indy Pace Car option. The package was primarily a decal package available on both the 442 and the Cutlass Supreme convertible. Many of the decals were not applied at the factory, but were to be applied by the dealership when the car was prepped for the customer, most notably the large “Official Pace Car” door decals.  See the part numbers, paint and decal placement instructions HERE.

Cutlass – The two-door Cutlass models rolled on a shorter wheelbase and carried the Cutlass S nameplate. Only closed cars were found in this series for 1970 with the convertible moving up to the Supreme line. Models included a pair of two-doors, and a pair of four-doors While the four-door station wagon was considered part of the Vista Cruiser line, and now called “Custom Cruiser”. Standard equip­ment included all items from the F-85 list plus: special chrome molding package; DeLuxe steering wheel; interior light package and special hood design. Standard tire size was G78 x 14 inches. Interiors were done in vinyl or cloth.

Cutlass Supreme – Three models were available under the Cutlass Supreme nameplate, which now included a convertible. Also available, exclusively in this series, was the new SX package. It included some special engine items, coupled with distinct internal and external markings. Standard equipment on this series included all items from the Cutlass group plus: Flo-thru ventilation; special dash; V-8 engine; DeLuxe steering wheel and Custom Sport seat. Standard tire size was G-78 x 14 inches. Interiors could be done in cloth or vinyl.

442 – Continuing as a series this year was the 442. High-performance con­tinued to sell well for Oldsmobile in 1970 and the response was a ne422 CID V-8 in standard and W-30 trim. Three models, all two-doors, were available as 442s. Standard equipment included all items from the Cutlass list plus: foam padded seats; special Handling Package; external and internal emblems; DeLuxe steering wheel; special engine; low-restriction exhaust system and special paint stripes. Standard tire size was G-70 x 14 inch raised letters. Upholstery was done in either vinyl or cloth.

W-30 Package: It should be noted that the W-30 package was considered a separate model with special parts and pieces not found on the standard 442 – and some of which were not available on the regular car. It carried its own paint scheme as well.

Base V-8 – All Transmissions:  Overhead valves. Cast iron block. Five main bearings.
Displacement: 350 CID.
Bore and stroke: 4.057″ x 3.385″.
Compression ratio: 9.0:1.
Horsepower: 250 @ 4400 RPM.
Torque: 355 @ 2600 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 250°, Exhaust 264°, Overlap 36°, Lift 0.400″ (intake), 0.400” (exhaust).
Carburetor: Rochester 2-barrel (manual transmission) 7040155 (automatic) 7040156.

Optional High Compression V-8 – All Transmissions: Overhead valves. Cast iron block. Five main bearings.
Displacement: 350 CID.
Bore and stroke: 4057″ x 3.385″.
Compression ratio: 10.25:1.
Horsepower: 310 @ 4800 RPM.
Torque: 390 @ 3200 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 250°, Exhaust 264°, Overlap 36°, Lift 0.400″ (intake), 0.400” (exhaust).
Carburetor: Rochester 4-barrel (manual transmission) 7040250 (automatic transmission) 7040255.

Optional W-31 OAI V-8 – All Transmission: Overhead valves. Cast iron block. Five main bearings.
Displacement: 350 CID.
Bore and stroke: 4.057″ x 3.385″.
Compression ratio: 10.50:1.
Horsepower: 325 @ 5400 RPM.
Torque: 360 @ 3600 RPM.
Valve Head Size: (intake) 2.003″-1.990″; (exhaust) 1.629″-1.619″.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 308°, Exhaust 308°, Overlap 82°, Lift (intake) 0.474″, (exhaust) 0.474”.
Induction: Forced Air (OAI)
Carburetor: Rochester Quadra-jet 4-barrel (all transmissions) 7040255.

455 CID SX V-8 Automatic Transmissions: Overhead valves. Cast iron block. Five main bearings.
Displacement: 455 CID.
Bore and stroke: 4.125″ x 4.250″.
Compression ratio: 9.0:1.
Horsepower: 320 @ 4200 RPM.
Torque: 500 @ 2400 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 258°, Exhaust 272°, Overlap 44°, Lift 0.435″ (intake), 0.435” (exhaust).
Carburetor: Rochester 2GC 2-barrel (automatic transmission) #7040154.

NOTE: This engine was superseded by the standard 442 automatic V-8 in February 1970.

455 CID 442 V-8 Automatic Transmission: Overhead valves. Cast iron block. Five main bearings. 
Displacement: 455 CID.
Bore and stroke: 4.125″ x 4.250″.
Compression ratio: 10.5:1.
Horsepower: 365 @ 5000 RPM.
Torque: 500 @ 3200 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 285°, Exhaust 287°, Overlap 57°, Lift 0.472″ (intake), 0.472” (exhaust).
Carburetor: Rochester Quadra-jet 4-barrel (automatic transmission) #7040251.

455 CID V-8 – Manual Transmission: Overhead valves. Cast iron block. Five main bearings. 
Displacement: 455 CID.
Bore and stroke: 4.125″ x 4.250″.
Compression ratio: 10.5:1.
Horsepower: 365 @ 5000 RPM.
Torque: 500 @ 3200 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 294°, Exhaust 296°, Overlap 68°, Lift 0.472″ (intake), 0.472” (exhaust).
Carburetor: Rochester 4MV (Quadra-Jet) 4-barrel Model 7040253.

455 CID 442 W-30 V-8 Automatic Transmission: Overhead valves. Cast iron block. Five main bearings.
Displacement: 455 CID.
Bore and stroke: 4.125″ x 4.250″.
Compression ratio: 10.5:1.
Horsepower: 370 @ 5200 RPM.
Torque: 500 @ 3600 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 285°, Exhaust 287°, Overlap 57°, Lift 0.472″ (intake), 0.472” (exhaust).
Carburetor: Rochester Quadra-jet 4-barrel (automatic transmission) #7040258.

455 CID  W-30 V-8 Manual Transmissions: Overhead valves. Cast iron block. Five main bearings.
Displacement: 455 CID.
Bore and stroke: 4.125″ x 4.250″.
Compression ratio: 10.50:1.
Horsepower: 370 @ 5200 RPM.
Torque: 500 @ 3600 RPM.
Valve lifters: Hydraulic.
Camshaft Duration: Intake 328°, Exhaust 328°, Overlap 108°, Lift 0.475″ (intake), 0.475” (exhaust).
Induction: Forced Air (OAI)
Carburetor: Rochester Quadra-jet 4-barrel #7040256.

NOTE 1: Except where cited, Torque is in lb. ft.

NOTE 2: For more engine information, you may access the the 1970 Oldsmobile mid-size AMA Specifications Sheets HERE  and the 1970 Oldsmobile 442 Specific AMA Specifications Sheets HERE.