1000HP 1968 Plymouth Road Runner “Old Runner” & Engine Sound

Dennis Ermi’s 1968 Plymouth Road Runner wears a custom Pearlescent Orange and Black paint job and hides a 472-cubic-inch big-block built to make somewhere around 1,000 horsepower, numbers that have nothing to do with the nameplate’s budget-muscle-car reputation. Ermi has owned the car since 2009 and built it up gradually, the paint and engine work both added well after purchase. Viewers keep coming back to one detail in particular: the blower whine. Watch to hear it for yourself.

Some engines are built to be driven gently on Sunday mornings and admired from a distance. This 472-cubic-inch monster living inside a 1968 Plymouth Road Runner was built for neither. Its owner has spent years chasing a very specific combination of paint, sound, and raw output, and the numbers he has landed on, somewhere in the neighborhood of 1,000 horsepower, put this Road Runner in company most owners of the breed can only dream about. He calls the car “Old Runner,” a name that hardly hints at what happens once its owner puts his foot down.

A 472 Cubic Inches, Built to Intimidate

The number that matters most in this video is 472, the cubic-inch displacement of the big-block Mopar wedge sitting between the fenders of Dennis Ermi’s 1968 Road Runner, a size no factory big-block Chrysler ever came in from the assembly line. That is the giveaway that this engine was built, not bought, using a factory 440 block as the starting point and taking it out to 472 cubic inches through a stroker kit and overbore. Combined with the internal work Ermi has had done, host Lou Costabile pegs the output at around 1,000 horsepower, Hemi-territory numbers from a wedge-head engine most people assume tops out closer to half that. Big-block Mopar builders generally treat anything past 900 horsepower on a wedge engine as firmly into unicorn territory, which is exactly why Costabile made a point of calling out the number on camera rather than letting the car speak for itself.

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Pearlescent Orange and Black, By Design

Ermi’s Road Runner wears a Pearlescent Orange and Black scheme that is not a stock 1968 Plymouth color combination, and that is the point. Factory Road Runners came in a fairly restrained palette built around Rallye colors like Bright Blue and Sublime Green; the pearl-finish orange on this car reads as a deliberate, modern reinterpretation rather than a numbers-matching restoration. It is the kind of paint that photographs differently depending on the light hitting the show floor, exactly the effect a builder chases when the goal is stopping foot traffic at an indoor show like World of Wheels rather than winning a concours judging sheet. Plenty of builders would have played it safer with a more traditional Rallye color and let the drivetrain carry the whole story, which makes Ermi’s paint choice as much a personality statement as the engine bay underneath it.

The Blower Whine Everyone Is Talking About

Viewers who found this video years after it was filmed keep coming back to one thing: the sound. “That sounds Just Right! Love that Blower Whine and the exhaust tune is spot on!” one commenter wrote, and several others echoed the sentiment about how honest and old-fashioned the car sounds compared to modern muscle car reproductions. For a build pushing four figures in horsepower, restraint in the exhaust note is its own kind of engineering, proof that Ermi and his engine builder tuned this Road Runner to sound exactly as aggressive as it actually is, no more and no less.

From World of Wheels to YouTube Stardom

The interview took place at the Wisconsin State Fair Park in West Allis on February 23, 2017, during the World of Wheels tour stop, one of the longest-running indoor car show circuits in the country, and a regular filming location for Costabile’s “My Car Story” series. That format, walking the show floor and stopping owners mid-conversation rather than staging a formal studio interview, is part of why the channel has built such a loyal following; it captures cars and owners exactly as casual showgoers would encounter them, blower whine and all. Costabile’s willingness to let owners like Ermi talk through their own build history, rather than narrating over them, is a big part of why the channel keeps finding new fans years after episodes like this one first went up.

Why Old Runner Undersells the Car

Ermi’s own name for the car, “Old Runner,” undersells it almost comically once the engine fires. It is a nickname born from affection rather than marketing, the kind car owners give a build they have lived with for years rather than one built purely to flip at auction. Commenters picked up on that authenticity immediately, calling it “a great, honest, old-fashioned muscle car” and thanking Costabile for capturing “these old car stories” before they disappear from the show circuit for good.

The Road Runner’s Reputation as the People’s Muscle Car

It is worth remembering what the Road Runner nameplate was actually built to be: Plymouth’s answer to buyers who wanted GTO-level performance without a luxury trim price tag, built on the cheaper Belvedere platform and famously licensed its name and “beep-beep” horn straight from Warner Bros.’ cartoon character. A four-figure horsepower Road Runner running a custom stroker big-block is a long way from that budget-performance mission statement, and that contrast, blue-collar nameplate paired with a no-limits engine build, is part of what makes Ermi’s car stand out even among other heavily modified Mopars at a show like this.

A Decade of Ownership, Still Turning Heads

Ermi has owned this Road Runner since 2009, and by his own account the car did not arrive in this condition; the paint and the engine work documented in this video came later, the product of years of incremental investment rather than a single all-at-once build. That patience is exactly why the car reads as personal rather than purchased, and why, watching a decade-plus into ownership, Ermi still talks about it with the enthusiasm of someone who just picked up the keys.

What Old Runner Says About the Mopar Hobby Today

Ermi’s build sits at an interesting crossroads in the muscle car world: purists who want every Road Runner numbers-matching and stock, and builders who see the platform as a starting point for something the factory never dared attempt. Neither camp is wrong, and both were represented in the comments under this video, some praising the honesty of the sound, others simply marveling that a wedge-headed Mopar could touch four-digit horsepower at all. Whichever side of that debate a viewer falls on, Old Runner makes an unusually persuasive argument for the second camp, and it does so on a car most Mopar people would have dismissed as just another Road Runner from the outside.

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