Built by All Speed Customs and shown at the 2017 Detroit Autorama, this 1971 Plymouth Barracuda street machine skips the expected 426 Hemi entirely in favor of a V10 and a paddle-shift transmission most classic Mopar owners have never considered. Silver paint with red accents and a custom interior built around a subwoofer-packed rear seat round out a build meant to surprise a crowd that’s seen almost everything. Watch to find out why they call it Medusa.
Walk up to a heavily customized 1971 Plymouth Barracuda at a show like Detroit Autorama and the assumption is automatic: somewhere under that hood sits a 426 Hemi, or at least something wearing its name. This car, built by All Speed Customs and known simply as “Medusa,” breaks that assumption entirely. There is no Hemi here. What replaced it is stranger, more powerful in an entirely different way, and paired with a transmission most Barracuda owners from 1971 never could have imagined.
The Engine Nobody Expected
Instead of a big-block V8, Medusa runs a V10, a configuration that has almost no factory history in a Barracuda but plenty of history in the Mopar family more broadly through Dodge‘s Viper and Ram truck engines. Swapping a ten-cylinder into a classic E-body isn’t a decision made for nostalgia; it’s made for the specific, unmistakable sound and the visual novelty of an engine bay that looks nothing like what any period-correct judge would expect to find. For a street machine built to turn heads rather than satisfy purists, that’s precisely the point.
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Paddle Shifting a Muscle Car
Just as unexpected is the paddle-shift transmission behind that V10, a detail that firmly plants this build in the present rather than pretending to be a period-correct restoration. Classic Barracudas of this era came with either a column- or floor-shifted manual or a conventional automatic, nothing remotely close to the electronically controlled, driver-actuated shifting more commonly associated with modern performance cars. Pairing that kind of drivetrain with a 1971 body is a deliberate street-machine choice, prioritizing how the car drives and sounds today over any claim to factory authenticity.
All Speed Customs’ Approach to Body Modifications
Street machine builds like this one operate under different rules than a numbers-matching restoration, and All Speed Customs leaned into that freedom with real body modifications rather than a simple repaint. The bright silver paint set off with red accents reads as a deliberate show-car finish, the kind meant to catch light and cameras under convention center lighting rather than blend into a period-correct color palette. That willingness to reshape the car’s sheet metal, not just its mechanicals, is what separates a true street machine from a merely well-restored classic.
A Custom Interior Built Around Sound
Inside, the build reportedly carries a “wall of sound” setup in the back seat, referencing the competition car-audio tradition of packing a rear seat area with stacked subwoofers built for output rather than passenger comfort. Combined with a fully custom interior throughout, that detail signals a build meant to be experienced with more than just the eyes — a car engineered to dominate a show floor acoustically as much as visually, which is very much in keeping with the aggressive, attention-grabbing spirit its “Medusa” name implies, and a deliberate departure from the quieter, more restrained sound systems typical of period-correct restorations.
Why Detroit Autorama Is the Right Stage for a Car Like This
Detroit Autorama has spent decades as one of the most prestigious stages in American custom car culture, home to the Ridler Award and a magnet for builders who want their most extreme creations judged against the best in the country. Bringing a car like Medusa there, with its V10 swap, paddle-shift gearbox, and reworked bodywork, puts it directly in front of an audience that has seen nearly everything and still expects to be surprised. A build this unconventional isn’t just showing off — it’s making a specific argument about what a 1971 Barracuda can become once every assumption about what belongs under its hood gets thrown out entirely.
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