The Most Underrated Small Block Muscle Car Ever
Spend any time around muscle car conversations and the same names keep surfacing: big block Chevelles, fire-breathing Hemis, and Boss Mustangs. The V8s under those hoods are legendary for good reason — massive displacement, effortless torque, and a soundtrack that rewrites your priorities. But fixating on cubic inches means overlooking some genuinely brilliant performance engineering, because the small block story is just as compelling. Small block motors grace some of the most valuable muscle cars ever built, and they have a well-earned reputation for reliability.
Beyond the obvious small block Chevrolets, there is one deeply underrated muscle car that combines genuine style, serious pace, and a fascinating collection of factory-engineered parts. It comes from one of the oldest automakers in the world, has historically attracted a more discerning crowd of enthusiasts — and yes, Chuck D from Public Enemy. It deserves a much wider audience.
The Oldsmobile Cutlass W-31 Is The Perfect Small Block Muscle Car
Highlights Of The Oldsmobile Cutlass W-31
- Features a 350-cu.in. V8 with 325 horsepower and 360 lb-ft of torque
- The engine has a high-flow induction, aggressive camshaft timing, and an ability to rev hard
- The V8 was blueprinted at the factory
- Just 510 units of W-31-powered Oldsmobiles were built for 1968
If you did a quick poll around your office or among friends for their favorite muscle car of all time, there would be plenty of usual suspects. Mustangs, Camaros, Chargers — they would all get an honorable mention. One car very few people would shout out is the Oldsmobile Cutlass. That’s a shame, because there was one small block Cutlass that was a handsome, stylish muscle car with a finely tuned small block V8 that featured plenty of rare, purpose-built parts.
The W-31 Was The High-Performance Small Block Option For The Cutlass
The Oldsmobile Cutlass W-31 was essentially a small block performance package available for the 1968, 1969, and 1970 model years. While the Oldsmobile 4-4-2 was exclusively a big block muscle car — itself also an extremely overlooked icon — the automaker also offered the W-31 package for the regular Cutlass. This more unassuming muscle car began life as the Cutlass-based Ram Rod 350, before being renamed the W-31.
Even With A Small Block, This Cutlass Had Serious Levels Of Performance
With a 350-cu.in. V8 under the hood producing 325 horsepower and 360 lb-ft of torque, the car could easily be dismissed as a simple small block alternative for buyers who didn’t want to go full big block and opt for the full-fat 400 cid in the 4-4-2 W-30, which pumped out 360 horsepower. But the 350 was a pretty exotic engine, featuring high-flow induction, aggressive camshaft timing, and an ability to rev hard. The W-31 was designed for owners who wanted to head to the drag strip on weekends — and it still holds its own against period machines today.
The Cutlass W-31 Is An Underrated High-Performance Muscle Car
Oldsmobile Cutlass W-31 Specs
|
Engine |
5.7-liter V8 |
|
Power |
325 hp |
|
Torque |
360 lb-ft |
|
1/4 Mile |
13.94 seconds |
Source: Oldsmobile
The engine in the W-31 package was genuinely special. Starting with Oldsmobile’s version of the 350-cu.in. V8, the mill was upgraded with the so-called 308 camshaft, which had a .474-inch lift and an intake/exhaust valve overlap of 82 degrees. The connecting rods were also unique to the W-31 engine, and a freshly designed set of cylinder heads was included as well. The W-31 received an aluminum intake manifold topped by a “performance calibrated” 750-CFM Rochester Quadrajet carburetor, and in 1970 an air induction system in the form of twin scoops carved into the fiberglass hood.
The Factory Performance Mods On The Cutlass W-31 Are Extensive
Compression was increased from a standard 10.25 to 10.5:1 and, to top it all off, the W-31 came with a balanced and factory-blueprinted engine. Transmission choices were a heavy-duty three-speed manual as standard, with an M-20 wide-ratio four-speed manual and a close-ratio M-21 four-speed as options, all of which could be paired with a 3.91 or 4.33 Anti-Spin differential. The car also featured a heavy-duty clutch and cooling system. Creature comforts such as air conditioning, power brakes, and automatic transmission were not included as standard.
The Cutlass Is A Great-Looking Muscle Car
The styling of the Cutlass W-31 was spot on. The car is muscular, especially with the hood scoops, with curved haunches at the rear. Inside, the cabin is stylish and classy. The Cutlass W-31 had all the ingredients to be a classic — it’s just that not many people actually bought one. These cars were rare when they were built, and they are rarer still today.
The Cutlass W-31 Is Extremely Rare (And Won’t Cost A Fortune)
The Cutlass W-31 didn’t sell particularly well, especially compared to, say, the Mustang — Ford sold almost half a million of those in the first year — which makes it all the more interesting as a collector car. Just 510 units of W-31-powered Oldsmobiles were built for 1968, says Hagerty, with 440 going to Cutlass S Sport and Holiday coupes, 38 to F-85 Sport coupes, 30 to Cutlass Supreme Holiday coupes, and just two to Cutlass S convertibles. More than 200 additional engines were thought to have been snapped up directly by race teams. Oldsmobile built 913 examples the following year, including 26 Cutlass convertibles.
In 1970, Oldsmobile sold 1,352 W-31 Cutlasses before the option disappeared from the lineup. All of this makes the W-31 a very rare muscle car indeed. For comparison, the 1968 4-4-2 totaled 33,607 units, up from 24,829 the year before, divided into 24,183 Holiday Hardtops, 4,282 Sport Coupes, and 5,142 Convertibles.
The Oldsmobile Cutlass W-31 Is A Used Muscle Car Bargain These Days
At this point, one might assume that when one of these W-31s comes up for sale, it would be nudging at least six figures, in line with other rare and iconic muscle cars out there. Not so. Hagerty Valuation Tools gives a price for the 1969 model in good condition at around $36,800. Even more telling is that when a concours-condition 1970 Oldsmobile Cutlass S W-31 went up for auction at Kissimmee 2025 — one of just 528 four-speed manual W-31s produced — it sold for just $58,300.
Oldsmobile Is A Good Choice For An Affordable Alternative Muscle Car
Oldsmobiles in general from this era remain very affordable muscle cars. The base 1968 Oldsmobile 4-4-2, with a 325-horsepower 400-cid V8, goes for around $26,500 in good condition according to Hagerty. Even the very special 4-4-2 Hurst doesn’t command much of a premium. George Hurst’s Oldsmobile collaboration packed a 390-horsepower, 455-cid V8 with a special crankshaft, custom distributor, and carburetor. Only 515 of these cars were built, and in good condition they fetch around $38,100, per Hagerty.
Sources: Hagerty.com; Hemmings.com
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