Mercury Comet 1965 B/FX

Everybody remembers the SOHC Cammer Comets that terrorized A/FX in 1964, driven by names like Dyno Don Nicholson and Arnie Beswick. Fewer people remember what Bill Stroppe’s shop built the following year to chase down the class just below it, a stripped, small-block Comet that could embarrass cars with a full inch of displacement advantage. Read on to find out how a 289 beat cars it had no business beating.

Everybody remembers the SOHC Cammer Comets that terrorized A/FX in 1964, the cars driven by names like Dyno Don Nicholson and Arnie Beswick. Fewer people remember what Lincoln-Mercury did the following year to chase down the class just below it. The answer is a lot more interesting than a simple step down in displacement, and it involves a shop better known for off-road racing than drag strip glory. What did Bill Stroppe’s shop actually build for 1965’s B/FX class, and how did a small-block Comet end up outrunning cars that should have had it beat on paper?

A Different Weapon for a Different Class

While four exotic SOHC 427 Comets went to the same big-name drag racers chasing A/FX glory, Bill Stroppe’s shop quietly built fifteen lightweight Comet Cyclones running a considerably smaller 289 High Performance engine specifically to compete in the B/FX class, and that engine, built up with four Weber carburetors, could approach 400 horsepower from a displacement most people would never expect to produce numbers like that.

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Who Bill Stroppe Was

Bill Stroppe had already made a name for himself in off-road racing and Mercury’s factory-backed programs by the mid-1960s, running a Long Beach, California shop that Lincoln-Mercury trusted with exactly the kind of specialized, small-batch builds a factory assembly line couldn’t handle. His reputation for squeezing more out of less displacement than anyone expected made him the obvious choice when Mercury needed a competitive B/FX entry to complement the more headline-grabbing SOHC cars getting sent to the sport’s biggest names. Stroppe would go on to even greater fame later in the decade running Baja off-road programs for Ford, but in 1965 his shop’s expertise was still very much focused on wringing maximum performance out of Lincoln-Mercury’s factory-backed drag program, work that quietly built the technical foundation his later off-road career would rest on.

Weight Was the Real Secret Weapon

What made the B/FX Comets genuinely dangerous wasn’t just the engine, it was what Stroppe’s crew took out of the car. Fiberglass hood, doors, fenders, and bumpers, Plexiglas side and rear windows, and deletes for the radio, heater, sound deadening, and factory seating brought these Comets down to around 2,600 pounds, a weight that let a 289 punch well above its displacement class.

Inside the 289 High Performance

Ford’s 289 High Performance, the K-code engine that also powered early Shelby Mustangs, already carried solid lifters, a forged crank, and a high-rise intake as standard equipment before Stroppe’s crew ever touched it, giving his team a genuinely strong starting point rather than a stock engine needing a total rebuild. Swapping in four Weber carburetors on top of that foundation squeezed out the extra breathing these lightweight Comets needed to run with cars carrying a full inch or more of displacement advantage. Tuning four independent carburetors correctly took a level of hands-on expertise most street mechanics never developed, which is exactly the kind of specialized knowledge a shop like Stroppe’s brought to a factory-backed program most dealerships couldn’t have replicated on their own.

How Factory Experimental Classes Actually Worked

NHRA’s Factory Experimental classes in the mid-1960s were organized around power-to-weight ratios rather than raw displacement alone, which is exactly why a stripped 2,600-pound Comet running a 289 could compete honestly against heavier cars packing much larger engines. Understanding that ratio-based structure is the key to understanding why Stroppe built the B/FX Comets the way he did, adding displacement would have meant nothing if the car couldn’t also shed the weight to match a lower class. That rulebook logic is also why so many factory experimental builds from this era look almost identical in concept but wildly different under the skin, every shop was solving the same power-to-weight equation with whatever combination of displacement and stripped-out mass its engineers understood best.

The Fairlane Thunderbolt Playbook

It’s the same playbook Ford ran with the Fairlane Thunderbolt that same era, strip everything that doesn’t make the car faster, and let a smaller engine do a big engine’s job. Both programs proved that Ford and its partner shops understood something GM and Chrysler were slower to grasp in the mid-1960s, that a factory experimental car’s real advantage often came from an engineer’s spec sheet on unnecessary weight rather than another cubic inch under the hood.

A Class Win Nobody Expected

B/FX cars weren’t supposed to compete with the big-inch A/FX machines getting most of the magazine ink in 1965, but a stripped, small-block Comet running four Webers and barely 2,600 pounds could still put up numbers that embarrassed cars with a full inch or more of displacement advantage. That’s the part of this story that tends to get lost next to the more famous SOHC Cammer cars, the B/FX Comets proved that Stroppe’s shop understood weight reduction and carburetion just as well as anybody understood big-inch engine building.

What Survives Today

Surviving Stroppe-built B/FX Comets are exceedingly rare today, since race cars from this era were typically campaigned hard, crashed, cannibalized for parts, or simply scrapped once a newer combination made them obsolete, and only a handful of the original fifteen are known to still exist in anything resembling their original specification. That scarcity puts a verified example in a different collector category entirely from a restored street Comet, closer to a piece of drag racing archaeology than a driveable car, and provenance research on any surviving car typically involves chasing decades-old NHRA timing slips and period photographs just to confirm a chassis’s original build sheet.

Mercury’s Bigger Drag Racing Legacy

It’s a reminder that Detroit’s factory drag war in the mid-’60s wasn’t only about who had the biggest engine, it was about which shop understood the whole package, weight, carburetion, and chassis setup, well enough to make a smaller motor do a bigger motor’s job. Mercury’s broader performance lineup, from the later Cyclone GT to the winged Cyclone Spoiler, owes a real debt to what Stroppe proved on the strip with these fifteen unlikely B/FX cars, a lesson in lightweight engineering that outlasted the B/FX class itself by years.

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