Oldsmobile 442 W-30

442 W-30 at a glance

Outside air for the 1966 W-30

Oldsmobile introduced the W-30 quietly for 1966 as an addition to the L69 engine, the 4-4-2's 400 with three two-barrel carburettors. The L69 cost US$264.54 (1966) and was rated at 268 kW (360 hp) at 5,000 rpm and 597 Nm (440 lb-ft) at 3,600 rpm. The W-30 kept that rating and added a hotter camshaft and an induction system that drew cool air through tubes from openings at the front of the car.

The air hoses needed space under the bonnet, so Oldsmobile moved the battery to the boot. That ruled out the convertible for 1966. Only 54 W-30 cars came from the factory, and dealers installed another 97 kits.

1967 to 1969 with the Quadrajet and red wheel arches

GM's 1967 ban on multiple carburettors ended the triple-carb L69. The W-30 kept its 268 kW (360 hp) rating with a single four-barrel Quadrajet, hoses to slots above and below the parking lights, heavy-duty springs, chrome valve covers and new red plastic inner wing liners. Oldsmobile built 502 factory W-30 engines to satisfy NHRA homologation rules, and dealers fitted an unknown number more. Cars magazine tested a four-speed car with the dealer-only 4.33 axle and recorded 14.1 seconds at 103 mph for the quarter mile and 6.5 to 6.7 seconds to 60 mph.

For 1968 the intakes moved under the front bumper, feeding a dual-snorkel air cleaner, and the wheel arches were lined in bright red plastic. Car Life ran a four-speed W-30 with a 4.33 axle through the quarter mile in 13.3 seconds at 103.30 mph. W-30 cylinder heads also went into the W-45 engine of the 1968 Hurst/Olds. The 1969 W-30 carried the same forced-air layout and 268 kW (360 hp), now quoted at 5,400 rpm. Oldsmobile added the W-32 that year for buyers who wanted the forced-air induction with the base camshaft and an automatic.

The 455 W-30 of 1970

For 1970 the 4-4-2 received the 455 as standard, rated at 272 kW (365 hp) and 678 Nm (500 lb-ft). The W-30 version gave 276 kW (370 hp) at 5,200 rpm with the same torque at 3,600 rpm. Its parts list included a special camshaft, cylinder heads, distributor and carburettor, an aluminium intake manifold, a low-restriction air cleaner and the W25 fibreglass bonnet with functional twin scoops, 8 kg (18 lb) lighter than the steel one. Plastic inner wings and less sound insulation saved further weight.

An aluminium differential carrier and cover were extra-cost options at US$157 and US$58 (1970), fitted to around 350 cars according to autoevolution. The same source counts about 3,100 W-30 cars for 1970, 1,542 with the Turbo Hydra-Matic, which cost US$227 (1970). RM Sotheby's describes a 1970 W-30 convertible as one of 264 built, 96 of them with the four-speed. Motor Trend timed a four-speed W-30 with 3.91 gears at 14.2 seconds and 102 mph; Oldsmobile engineers had run 13.7 seconds with the same car after a fresh tune. Two W-30 Vista Cruiser wagons were built to special order.

The low-compression W-30 of 1971 and 1972

GM cut compression to 8.5:1 across its 1971 engines so they could use lower-octane fuel. The W-30 kept its forced-air bonnet and the 1970 camshaft and was rated at 261 kW (350 hp) gross, or 224 kW (300 hp) at 4,700 rpm and 556 Nm (410 lb-ft) at 3,200 rpm net. The musclecarclub history reproduced by Oldsmobiles Forever quotes 0-60 mph in 6.5 seconds and the quarter mile in 14.8 seconds at 98 mph for a 1971 W-30.

In 1972 the 4-4-2 became an appearance and handling package, W-29, and the W-30 option was the L77 455 with the same net rating. It came with low-restriction dual exhausts, the aluminium intake, the W25 bonnet, an anti-spin differential with 3.42 gears (3.73 optional) and heavy-duty cooling. The camshaft left too little idle vacuum for air conditioning, and power brakes were available only with the automatic. Oldsmobile built 659 W-30 coupés and 113 convertibles that year.

442 W-30 today: what to check

Many W-30 parts bolt on, so the engine and the paperwork matter more than the bonnet and stripes. RM Sotheby's sold a 1970 W-30 convertible, chassis 344670M243716, for US$247,500 at Fort Lauderdale in 2022 without its original factory documents. The chassis number shows the pattern: 344 for the 4-4-2, 67 for the convertible body, 0 for the 1970 model year.

• 1966-1967: dealer-installed kits are period-correct but were not factory W-30 cars.
• 1967-1968: red plastic inner wing liners are a W-30 feature.
• 1970-1972: look for the aluminium intake manifold and the W25 fibreglass bonnet.
• 1972: a W-30 left the factory without air conditioning.

The W-30's GM relatives were the Buick Gran Sport and the Chevrolet Chevelle. The whole 4-4-2 story is told in the Oldsmobile 4-4-2 hub, the brand's models are in the Oldsmobile catalogue, and the car's rivals are in the muscle car guide.