from 1968. 906 production Hurst/Olds Holiday Coupes were built, plus 6 prototypes and 2 convertibles. Performance was 0–60 in 5.9 seconds, the 1/4 mile in 14.03 seconds at . 1970 1970 was the pinnacle of performance from Oldsmobile.4-4-2 A Source Book, Casteele, p. 63 In order to keep up in the horsepower arms-race, General Motors dropped the cap on engine size in 1970, and Oldsmobile responded by making the Olds 455 V8 the standard 4-4-2 engine. Output was and , with a variant available with the W30 option. The 1970 model year can be identified by its vertical bars in silver grille, rectangular parking lights in front bumper, and vertical tail lights. The revised body style and increased performance resulted in the 4-4-2 being awarded pace car duties at the Indianapolis 500 race in 1970. A high-performance W-30 package was offered, which added a fiberglass hood (option W25) with functional air scoops and low-restriction air cleaner, aluminum intake manifold, special camshaft, cylinder heads, distributor, and carburetor. Two W-30 equipped 4-4-2 Vista Cruisers were produced by special order. Rear shoulder seat belts were optional at $23. Motor Trend tested a 4-4-2 W-30 with the four-speed manual transmission and 3.91:1 rear gears, clocking a quarter mile time of 14.2 seconds at . However, the magazine noted that Oldsmobile engineers had earlier posted a best of 13.7 seconds on the same test car with a fresh tune. New options for the 1970 4-4-2 included GM's variable-ratio power steering (option N47), a console-mounted Hurst Dual/Gate shifter for use with the Turbo Hydra-matic transmission, and aluminum differential housing and cover (option W27). All Oldsmobile V8s received new Positive Valve Rotators for the 1970s to increase engine valve life. 1971 Despite an industry-wide softening of muscle car sales, the 4-4-2 returned in 1971 with only minor modifications from the previous year. Engine output was down for 1971 due to a lower compression ratio (8.5:1), which affected all of GM's engines as the result of a corporate policy requiring engines to run on lower-octane regular leaded, low lead, or unleaded gasoline, in preparation for the introduction of the catalytic converter on 1975-model cars. The base 455 was rated at , with the W-30 achieving a rating of . The W-27 option was downgraded to an aluminum cover for the cast iron differential housing. The 1971 4-4-2 was available in a hardtop coupe and convertible body type. The