Pontiac Drilled 130 Holes Into This 1963 Catalina’s Frame – Then Sold It as a Street-Legal Drag Car

Pontiac drilled roughly 130 holes into a 1963 Catalina’s frame just to shave weight, then sold it through a regular dealership. It was one of seven street-legal factory drag specials Detroit built in the 1960s, each rarer and wilder than the last. Here’s what made all seven nearly impossible to insure.

Detroit’s engineers spent the early-to-mid 1960s waging a horsepower war so extreme that some of what they built was barely street legal — and buyers could still drive one home from a regular Pontiac, Ford, Dodge, or Plymouth dealership. The most extreme example was a 1963 Pontiac Catalina nicknamed “Swiss Cheese,” its frame rails perforated with roughly 130 holes just to shave off a few precious pounds. It wasn’t alone. Chevrolet, Ford, Dodge, and Plymouth each answered with their own stripped-down, engine-swapped factory drag specials, built in batches as small as 14 cars and rated at horsepower figures nobody quite believed at the time. Seven of these machines, chronicled in a deep-dive video making the rounds among muscle car historians, show just how far the factories were willing to go before insurers and safety regulators caught up to them.

Seven Cars Detroit Barely Wanted the Public to Notice

The video, from the YouTube channel American Muscle Cars, walks through the timeline year by year: the 1963 Chevrolet Impala Z11 and Pontiac Catalina Super Duty, the 1964 Ford Fairlane Thunderbolt, the 1965 Dodge Coronet A990, the 1966 Ford Fairlane 500 R-Code, and the 1968 Hurst-built Hemi Dart and Hemi Barracuda. Each entry gets the same treatment: how many were built, what made the engine special, and why the factory eventually pulled the plug on the program.

The horsepower race that produced all seven of these cars didn’t start as a marketing plan — it traces back to Pontiac’s 1964 GTO, which turned a mid-size coupe into a genuine performance icon almost by accident and forced Ford, Dodge, Chevrolet, and Plymouth to respond. The Big Three’s answer wasn’t just bigger engines dropped into showroom cars; it was small, purpose-built batches engineered specifically to win NHRA and AHRA Super Stock classes, then quietly discontinued once they’d done their job.

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What comes through clearest is how deliberate all of this was. These weren’t hot-rodded street cars modified after the sale — they were assembled on factory lines, homologated for organized drag competition, and in several cases delivered to dealers with no radio, no heater, and door panels thin enough to see daylight through. The goal was simple: build just enough of them to qualify for a racing class, then let the wins on Saturday night sell cars on Monday morning.

The Swiss Cheese Pontiac and Chevy’s Secret 427

Pontiac’s 1963 Catalina Super Duty earned its nickname honestly. To meet NHRA’s minimum weight rules while still running a full-size body, engineers drilled roughly 130 holes through the frame rails, trunk floor, and other structural points, then bolted on aluminum front-end sheet metal in place of steel. Under the hood sat the 421-cubic-inch Super Duty V8, officially rated at 420 horsepower but widely believed to produce closer to 500 once properly tuned. Pontiac built only 14 of these before General Motors’ corporate racing ban in January 1963 shut the program down — nine are known to survive today.

Chevrolet’s answer arrived the same year with the Impala Z11. Rather than starting from a clean sheet, engineers bored and stroked the existing 409 into a 427-cubic-inch drag-only V8, fed by dual four-barrel carburetors through a high-rise aluminum intake, and rated it at 430 horsepower and 575 pound-feet of torque — figures most racers at the time assumed were conservative. GM built the package into lightweight Impala Sport Coupes, stripped of insulation, radios, and heaters, with aluminum front bumpers and body panels. Sources disagree on the exact count — estimates run from 50 to 57 — but every one was gone before the same corporate ban ended the run.

Ford’s Assembly-Line Race Cars

Ford answered in 1964 with the Fairlane Thunderbolt, a mid-size sedan that Dearborn essentially turned inside out: fiberglass hood, doors, and front fenders, a plexiglass rear window, and a 427-cubic-inch High-Riser V8 shoehorned under a functional hood scoop. Ford built right around 100 Thunderbolts — 49 with four-speed manuals, 51 with automatics — and the car promptly won the 1964 NHRA Super Stock championship. Two years later, Ford tried a subtler version of the same idea with the 1966 Fairlane 500 R-Code: 57 identical two-door hardtops, all finished in Wimbledon White with black interiors, each running a dual-quad 427 rated at 425 horsepower. Ford stopped building them not because demand dried up, but because the exhaust manifolds were too difficult to manufacture at scale.

The Hemi Twins That Closed Out the Program

Dodge’s 1965 Coronet A990 pushed the lightweight formula further by acid-dipping body panels to cut wall thickness by more than 60 percent, then dropping in a 426 Race Hemi hand-assembled at Chrysler’s marine engine facility in Marysville, Michigan — good for well over 500 horsepower. Only 101 were built. By 1968, Chrysler had refined the formula one final time, hiring Hurst to graft 426 Hemis into standard Dodge Dart and Plymouth Barracuda bodies. Roughly 80 Hemi Darts and 70 Hemi Barracudas rolled out that year, sharing a pool of just 150 race-spec Hemi engines between them — among the rarest factory-built muscle cars Detroit ever sold.

Chevrolet would return to this same factory-lightweight playbook before the decade closed, most famously through the Yenko-tuned Camaros that turned a regular Camaro SS into a 427-powered giant killer — one of which recently sold for a record price, more than any Camaro in history. The line from these obscure 1963-68 factory drag specials to that headline sale is direct: without Detroit proving it could build, and sell, cars this extreme, none of what came after would have had a blueprint to follow.

None of these seven cars were built to be comfortable, common, or even particularly profitable — they existed to win a numbers game against NHRA and AHRA rulebooks, and to put a manufacturer’s name on a Saturday-night trophy. Because so few were built, and fewer still survive with their original engines and paperwork intact, verified examples now regularly cross the block at Mecum and Barrett-Jackson for well into six and seven figures — prices that would have stunned the dealers who once struggled to move them off the lot. The video’s comment section fills in the rest of the picture: owners and their children describing Hurst four-speeds, glasspack exhaust, and fathers who quietly built race cars in the garage after work. Six decades later, that combination of scarcity and firsthand memory is exactly what keeps these survivors climbing at auction.

Watch the full video above and let us know your thoughts in the comments.