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The base 455 was rated at 340 hp (254 kW), with the W-30 achieving a rating of 350 hp (261 kW). The W-27 option was downgraded to an aluminum cover for the cast iron differential housing. 1971 Oldsmobile 442 W30 in Antique Jade Green. The 1971 4-4-2 was available in a hardtop coupe and convertible body type.
Also available was the L77 V code 455 with 270 horsepower (200 kW) available only without air conditioning. Although Pontiac's SD 455 cubic-inch engine lasted one more year with 290 horsepower (220 kW), Oldsmobile's high performance 455 engine would only last one more year culminating with the L76 optioned 455 W-30 Hurst/Olds in 1974.
1968 and 1969 400s shared the Olds big-block standard 4.25 in (107.95 mm) stroke with the 455 but used a undersquare 3.87 in (98.30 mm) bore to comply with GM's maximum 400 cu. in. displacement restrictions in the A-body cars while also reducing tooling costs. Displacement is similar to the earlier engine, at 399.9 cu in (6,554 cc).
All Cutlass models came standard with front disc brakes [16] The standard engine was a 180-horsepower (134 kW) 350 Rocket V8 (K VIN engine code), a 200-horsepower (149 kW) 350 Rocket V8 with dual exhaust (M code), a 250-horsepower (186 kW) 455 Rocket V8 (U code, or L75), and a 270-horsepower (201 kW) 455 V8, with a hotter cam and W30-style ...
The '74 Stage 1 455 was only available with the Turbo 400 automatic and detuned to 245 hp (183 kW). This engine was also offered on other Buicks in 1974 including the Riviera, LeSabre and Electra. 1973-1975 Oldsmobile Cutlass Hurst/Olds W-30 — These were built using 455 cid V8 engines in the W-30 trim.
The 1971 455 HO was rated at 335 hp (250 kW) at 4,800 rpm and 480 lb⋅ft (651 N⋅m) of torque at 3,200 rpm . The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport.
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The Oldsmobile Cutlass Supreme is a mid-size car produced by Oldsmobile between 1966 and 1997. It was positioned as a premium offering at the top of the Cutlass range. It began as a trim package, developed its own roofline, and rose during the mid-1970s to become not only the most popular Oldsmobile but the highest selling model in its class.