Mercury Comet 1964 A/FX 427

Dearborn Steel Tubing built 21 Mercury Comet A/FX cars for 1964, each with a NASCAR-derived 427 High Riser rated at a deeply understated 425 horsepower, fiberglass hood, fenders, doors and bumpers, and Plexiglas windows throughout. At roughly 3,200 pounds they ran 11.3 to 11.6 at around 125 mph. Dyno Don Nicholson, Ronnie Sox and Jack Chrisman all drove them. Read on for what separates a documented original from a very good tribute.

Twenty-one. That number is not a horsepower rating, an elapsed time, or a production year. It is the entire output of one of the most single-minded drag racing programs any American manufacturer ever funded, and the cars wore Mercury badges rather than Ford ovals. Underneath fiberglass panels shaped like a mid-size family compact sat an engine built for NASCAR superspeedways, installed by a specialty shop on the West Coast that had been building Ford’s competition machinery for years. Nothing about these Comets was intended to be sold, driven to work, or explained to an insurance agent. They existed to win one class, in one season, against a very specific set of rivals.

What A/FX Actually Meant

Factory Experimental was the class NHRA created for cars that had outgrown Super Stock’s pretense of being showroom vehicles. Super Stock demanded that a car be something a customer could theoretically order from a dealer. A/FX allowed manufacturers to move engines, relocate axles, substitute lightweight body panels, and generally build a purpose-made drag car that merely resembled a production model. The class produced the most spectacular machinery of the early 1960s and, within two years, mutated into the altered-wheelbase cars and then into Funny Cars entirely. The 1964 season sits right at the peak, when the cars were still recognizable and already completely unreasonable.

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Dearborn Steel Tubing Built These, Not Stroppe

Ford handed the Comet program to Dearborn Steel Tubing, the same Detroit-area specialty shop that was already turning Fairlanes into Thunderbolts for the Total Performance push. DST hand-formed the shock towers and firewall to shoehorn the 427 into an engine bay that was never meant to swallow anything bigger than a 289, then handled the fiberglass conversion and the chassis work that made the cars survivable at the strip. Bill Stroppe’s Long Beach operation, with its long history of preparing Mercurys for endurance and off-road competition including the famous Comet durability runs at Daytona, is a real part of this car’s story, but it belongs to 1965, when Stroppe built eight further Comet A/FX cars split between the 427 High Riser and the new 427 SOHC Cammer. Knowing which shop touched which season is exactly the kind of detail that separates a documented original from a good guess.

The 427 High Riser

The engine was Ford’s 427 High Riser FE, a race-only configuration with a tall-deck intake manifold carrying two Holley four-barrels, solid lifters, and a compression ratio well beyond anything sold to the public. Ford rated it at 425 horsepower gross, a figure calculated for class-weight purposes rather than accuracy, and one that nearly everyone in the sport understood at the time to be substantially understated. The High Riser’s intake was so tall that it required a hood modification on every car it went into, which is exactly why the fiberglass hoods on these Comets carry their distinctive raised profile. The scoop was never decoration.

Where the Weight Went

Fiberglass replaced the hood, front fenders, doors, and bumpers. Plexiglas replaced the side and rear glass. The heater, radio, sound deadening, and most interior trim were never installed in the first place. Battery and much of the electrical mass moved rearward to aid weight transfer on launch. The finished cars weighed in the neighborhood of 3,200 pounds, roughly what a modern compact sedan weighs, but with an all-iron 427 hanging over the front axle and a live rear axle on leaf springs trying to put every bit of it down. Elapsed times in the 11.3 to 11.6 range at around 125 miles per hour followed directly from that arithmetic.

The Drivers Who Made Them Famous

The Comet A/FX cars were handed to a roster that reads like an early-sixties drag racing hall of fame, with Dyno Don Nicholson, Ronnie Sox, Jack Chrisman, Hayden Proffitt, Ed Schartman, and Wild Bill Shrewsberry among them. Nicholson’s Comet became the definitive example, winning at the highest level and establishing the car’s reputation before the season was even half over. Chrisman took his in an entirely different direction, adding a supercharger and building what is widely regarded as one of the direct ancestors of the Funny Car, a machine that had abandoned any pretense of stock appearance in favor of pure spectacle.

Mercury Had a Reason to Spend the Money

Mercury in 1964 had an identity problem. The division sat between Ford and Lincoln with no clear performance story, selling cars that were competent and largely invisible to anyone under forty. The A/FX program, along with the Daytona durability runs where Comets covered enormous distances at sustained speed, was a deliberate campaign to attach the brand to something other than middle-management respectability. It worked in the short term, and Comet became a name people genuinely associated with speed, even though the division would spend the following decades drifting steadily back toward exactly the position it had been trying to escape.

Surviving Cars and the Documentation Problem

Twenty-one cars, campaigned brutally, in an era with no expectation that any of them would ever be historically significant, is a recipe for severe attrition. Cars were crashed, re-bodied, converted to later classes, sold on, and stripped for parts. What survives today is tracked closely by specialists, and the market distinguishes sharply between a documented original with continuous history, a restored car assembled from correct components, and a tribute built decades later. Original fiberglass, correct Dearborn Steel Tubing-specific fabrication details, and period photographs matching a specific chassis are what separate the categories, and the price differences between them are enormous.

The Last Year It Made Sense

By 1965 the factory drag wars had escalated past the point where A/FX cars still resembled anything on a showroom floor. Wheelbases were altered, engines moved rearward, and injected nitro replaced carburetors. Within two more seasons the whole category had become Funny Car, with fiberglass shells over tube frames and no meaningful connection to production vehicles at all. The 1964 Comet sits at exactly that boundary, extreme enough to be genuinely wild and restrained enough that it still reads unmistakably as a Mercury. That balance is precisely why these cars matter far more than their production figure alone would suggest.

The Thunderbolt Comparison

The obvious sibling to the A/FX Comet is Ford’s own 1964 Fairlane Thunderbolt, and the two make an instructive pair. Both carried the 427 High Riser with the same understated 425-horsepower rating. Both traded steel for fiberglass and glass for Plexiglas. The Fairlane program produced roughly a hundred cars. The Comet program, built by that same Dearborn Steel Tubing crew rather than a separate West Coast shop, produced twenty-one. The Comet also started from the smaller Falcon-based platform, which gave it a modest weight advantage. Ford effectively ran two parallel lightweight programs in one season, and the Mercury version has always been the scarcer and less-documented half of the story.

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