“What’s the greatest engine Ford Motor Company ever made?” The answer to that will take up some very heated debate, and a lot of internet – and it still wouldn’t set things straight. But the Cobra Jet is definitely among the finalists. Born at the height of the classic Detroit horsepower wars, this 428-cubic-inch V8 transformed the humble pony car into an undisputed quarter-mile terror during the 1968 season.
Before the R-code powerhouse arrived, Mustang buyers craving big-block displacement had to settle for the S-code 390-cubic-inch V8, which struggled to hold off rival Chrysler and General Motors machines. Rhode Island dealer Bob Tasca pioneered the winning formula by mating a 428-cubic-inch Police Interceptor block with free-breathing 427-cubic-inch Low-Riser cylinder heads, heavy-duty exhaust manifolds, a cast-iron intake, and a 735-cfm Holley four-barrel carburetor fed through a functional Ram Air hood scoop.
Ford proved the concept in February 1968 at the Pomona NHRA Winternationals with 50 Wimbledon White lightweight fastbacks before launching showroom sales on April 1, 1968. That mid-year release swept the Shelby Mustang off its wheels by offering superior straight-line performance in a regular Mustang at a lower cost. Ultimately, it built the wall and put the writing on it declaring the dusk of the fabled Carroll Shelby muscle pony program.
Although the 1968 Shelby GT500KR shared the exact same 428-cubic-inch Cobra Jet engine, the heavily stylized Shelby carried extra weight and a hefty $4,473 sticker price. Street racers quickly realized a regular Ford Mustang fastback packed identical mechanical punch in a lighter, subtler body without the luxury markup. One of the finest surviving examples of that mid-year breed is now offered by collector Ben Shearman.
Photo: GTS Classic Motors
Showcased in a walkaround video on the GTS Classic Motors YouTube channel, this 1968½ Ford Mustang GT Fastback 428 Cobra Jet comes directly from the personal collection of Ben Shearman. Finished in factory Wimbledon White, the numbers-matching R-code fastback pairs its 428-cubic-inch V8 with a factory 4-speed manual transmission and the ultra-rare factory 4.30 Traction-Lok rear axle, a combination that makes it a 1-of-1 build per its Deluxe Marti Report.
Whoever ordered this Mustang in 1968 had only drag-strip dominance in mind, specifying a blue standard interior, radio delete, manual steering, no fold-down rear seat, and virtually no extra weight-adding options. Its provenance is backed by the Deluxe Marti Report, owner’s manual, period dealer literature, and Cobra Jet 50th Anniversary memorabilia. The package even includes a photograph hand-signed by legendary 1968 Cobra Jet drag racer Al Joniec holding a winner’s trophy.
Fresh off a three-year concours rotisserie restoration, the laser-straight body wears high-gloss Wimbledon White paint that pays homage to the original 50 lightweight race cars. It retains the signature black 1968.5 Cobra Jet hood stripe and a dark blue GT side stripe, riding on GT wheels with trim rings and brand-new Goodyear Polyglas tires. Underneath, the chassis replicates Dearborn assembly-line perfection with proper primers, factory overspray patterns, and inspection stamps.
Photo: GTS Classic Motors
Under the hood, the correct 428-cubic-inch Cobra Jet V8 displays every period-authentic component, including the rare starter delay system, proper S-tube, smog equipment, correct carburetor, fuel pump, hanging radiator tag, battery, and 1968-only trim. With 25 sorting miles logged since completion, the big-block starts effortlessly and idles like it knows people in high places. Inside, the restored blue cabin presents as new, down to the Autolite floor mat and Dearborn final acceptance markings.
Production figures highlight just how scarce this mid-year brute truly is. Out of 317,423 Mustangs built for the 1968 model year, only 17,458 cars received the GT Equipment Group across the board. That includes 289s, 302s, S-code 390s (any Bullitt fans out there?), and the mighty 428 V8 options.
Counting both Ford and Shelby assembly lines, total 1968 production with the R-code 428-cubic-inch Cobra Jet engine reached 2,870 vehicles, split between 1,571 Shelby GT500KR models and 1,299 regular non-Shelby Ford Mustangs.
Photo: GTS Classic Motors
Every retail 1968 R-code Mustang came with the mandatory GT package, dividing those 1,299 cars into 1,044 fastbacks, 221 hardtop coupes, and 34 convertibles. Buyers could pair the formidable big-block V8 only with a heavy-duty Toploader 4-speed manual or a C6 3-speed automatic, with 792 of the 1,044 fastbacks receiving the 4-speed and 252 getting the automatic. When new, a $2,712 fastback with the $421 engine and $147 GT package cost $3,280.
On paper, Ford rated the 7.0-liter Cobra Jet V8 with its 10.6:1 compression ratio at a conservative 335 horsepower at 5,200 rpm and 440 lb-ft of torque at 3,400 rpm, though real output approached 410 horsepower. Period magazine testers in 1968 clocked 0 to 60 mph in 5.4 seconds, the eighth-mile in 9.54 seconds at 82.5 mph, the quarter-mile in 13.56 seconds at 106 mph, and a 129-mph top speed.
As the owner and seller notes during his walkaround, the beauty of a 1968.5 Cobra Jet GT fastback lay in its understated street presence, often fooling unsuspecting rivals into thinking they were lining up against a mild 390-cubic-inch Mustang. Once the four-speed and 4.30 gears hooked up, competitors only saw taillights. No joke – Hemi Mopars found out the hard way at the Pomona Winternationals, when the Cobra Jets eliminated everyone lining up against the white Mustangs.
