Hemi War – Hemi Cuda v Hemi Road Runner – 1/4 Mile Drag Race Video – Road Test TV

A 1968 Hemi Road Runner and a 1970 Hemi Cuda share the exact same 426 Hemi, the same 425-horsepower rating, and the same Torqueflite automatic — yet this quarter-mile shootout from Road Test TV isn’t close to even. One car leaves the line with what viewers call a genuinely bad reaction time and still crosses the stripe first. Commenters are left arguing about gear ratios, tire choice, and whether 4.56s are involved. What actually separates two nearly identical elephant motors on race day?

On paper, this shouldn’t even be a contest. A 1970 Hemi Cuda is the newer, more aggressive car; a 1968 Hemi Road Runner is heavier, plainer, and built two full model years earlier. Both are running Mopar’s legendary 426 cubic-inch elephant motor with factory dual four-barrel carburetors, both rated at exactly 425 horsepower, both backed by the same Torqueflite automatic — so this quarter-mile shootout from Road Test TV should be close to a coin flip. It isn’t. One car leaves the line with what viewers call a genuinely bad reaction time and still finds a way to win, and the comments are full of people trying to figure out exactly how. What actually decided this race?

Same Engine, Same Rating, Same Transmission — So Why Isn’t This Race Even?

It’s rare to find a drag race with this much controlled for and this little decided in advance. The 1968 Plymouth Road Runner and 1970 Plymouth Hemi Cuda featured in this Road Test TV matchup are both powered by Chrysler’s 426 cubic-inch Hemi V8, equipped from the factory with dual four-barrel carburetors and rated at an identical 425 horsepower. Both cars route that power through the same Torqueflite automatic transmission, which strips away one of the biggest variables that usually separates muscle car drag races — a manual driver’s reaction time and shifting skill against an automatic’s consistency. With engine, rating, and transmission all matched, what’s left to decide the race is everything else: weight distribution, gearing, tire condition, launch technique, and two model years of chassis and suspension differences between a 1968 intermediate and a 1970 pony car. That’s exactly the kind of matchup that makes for a genuinely unpredictable quarter mile, and viewers picked up on it immediately, with one calling this simply the best drag race on YouTube.

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425 Horsepower on Paper: What the Elephant Motor Was Really Rated For

The 425 horsepower rating stamped on both these Hemis tells only part of the story, and longtime Mopar fans know it. Chrysler’s factory ratings for the 426 Hemi were notoriously conservative by modern standards, a reflection of an era when insurance companies and racing sanctioning bodies were paying close attention to advertised output. The dual four-barrel setup on both cars, combined with the Hemi’s signature hemispherical combustion chambers and genuinely massive valve sizes, meant real-world output likely ran well ahead of that factory number on both the Cuda and the Road Runner. One commenter’s reaction sums up the gap between spec sheet and reality: ‘wow, 12 second Mopars made in 1970… badass’ — a nod to just how quick these numbers translate into elapsed time even by today’s standards, let alone against anything else on the road when these cars were new. That’s the elephant motor’s whole reputation in a sentence: understated on paper, ferocious on the strip.

A Bad Reaction Time and a Win Anyway

Here’s the detail that actually drives the comment section: the Road Runner, by most viewer accounts the heavier and less glamorous of the two cars, leaves the line with what one commenter flatly calls ‘a terrible reaction time’ — and still crosses the finish line ahead. That’s not a small thing to overcome in a quarter-mile race against a car sharing its exact engine and transmission combination. A poor launch typically costs a car several tenths of a second it simply cannot claw back over such a short distance, especially against equally matched machinery. Whatever ground the Road Runner gave up off the line, it apparently made up somewhere in the run, whether through better traction down track, a more favorable gear ratio, or simply a stronger overall combination once rolling. Commenters are visibly puzzled by it, with more than one asking essentially the same question in different words: how does the heavier, worse-launching car still take this one home?

The Gear Ratio Question Nobody in the Comments Could Fully Answer

Gearing is where the comment section’s curiosity lands hardest, and for good reason — with engine output and transmission held constant between the two cars, final drive ratio is one of the biggest remaining levers left to explain a result like this. One viewer asks directly about the final drive ratios on both cars, while another wonders specifically whether either is running 4.56 gears, a notably aggressive ratio favored for straight-line acceleration at some cost to top-end speed and highway manners. Without confirmation from the video itself, the comments are left speculating, but the question is the right one to ask: two nearly identical drivetrains producing a non-obvious result almost always comes down to exactly this kind of unglamorous mechanical detail rather than anything visible in the footage. It’s a reminder that quarter-mile results are decided as much in the rear axle as under the hood, especially once the engines themselves are functionally tied.

Street Tires and Sub-12-Second Passes

Traction gets its own round of scrutiny in the comments, with viewers asking point-blank whether these Hemis were running on period-correct street tires rather than dedicated drag rubber. If so, the sub-12-second passes both cars appear capable of are genuinely impressive by any era’s standard — street tires offer meaningfully less grip off the line than purpose-built drag radials or slicks, making consistent, quick reaction times and clean launches considerably harder to pull off. ‘Were they on street tires? Sub 12’s is impressive’ captures the tone of that thread precisely. Whatever rubber was actually mounted, the run described in the comments — two 425-horsepower Hemis trading a photo-finish quarter mile — lines up with exactly what made the 426 Hemi era so respected among performance enthusiasts: even in relatively stock trim, these were genuinely fast cars capable of backing up their reputation on demand, not just in factory brochures.

The Camera Shake Everybody Forgave

Road Test TV’s own description includes an apology most drag race videos don’t need: sorry for the camera shake, the cameraman nearly fell over from what’s affectionately called the Elephant Stampede — a nod to the 426 Hemi’s long-running ‘elephant motor’ nickname, earned from the engine’s sheer physical bulk under the hood. It’s a small, self-deprecating detail, but it captures something real about filming a run between two genuinely violent Hemi launches at close range: even someone used to being trackside can get caught off guard by the sound and force of two 425-horsepower big blocks leaving the line together. Nobody in the comments treats the shake as a real complaint — if anything, it reads as evidence the footage is unstaged and shot close enough to the action to feel every bit of it, rather than a polished, distant, studio-safe angle.

Why Viewers Call This the Best Drag Race on YouTube

Add it all up and it’s easy to see why this particular matchup keeps getting singled out. Two genuinely rare, genuinely fast Mopars — a 1968 Hemi Road Runner and a 1970 Hemi Cuda — running the exact same engine and transmission combination, with a result close enough that commenters are still debating gear ratios and tire choice well after the fact. ‘Best drag race on youtube’ isn’t a throwaway compliment in threads like this; it’s earned by exactly the kind of unresolved mechanical mystery this video leaves behind. Nothing about the outcome is explained away by a horsepower gap or a transmission advantage, which forces the conversation into the more interesting territory of launch technique, final drive gearing, and tire condition — the actual variables that separate two nearly identical elephant motors on race day.

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