1968 Plymouth Barracuda Formula S: A Factory Big-Block Barracuda With A Four-Speed? Yep.

Front driver 3q picture of teal 1968 Plymouth Barracuda Formula S Fastback parked on dried grass

Despite its reasonably strong collector popularity, some find the second-generation Plymouth Barracuda to be a little too close to its parent Valiant’s hard points to be a truly beautiful pony car. That doesn’t stop it from being my favorite of the Barracudas, and its humdrum production figures make it all the rarer today. One of the rarest of the bunch is the Formula S Fastback featuring a 383 and a four-speed. While this example has had a few modifications from factory stock, it’s a perfect driver example of a big-block pony car the way they did it in Highland Park, and it can be found on Hagerty Marketplace in Grenada, Mississippi.

1968 Plymouth Barracuda Formula S engine compartment with 383-cubic-inch engine

The 383 was first made available in 1967, when the Barracuda was restyled and made available in three bodystyles, including this sharp new fastback. In that first year, the 383 made 280 horsepower, enough for Hot Rod Magazine to wring out a 15.15-second quarter-mile time with a trap speed of 92 miles per hour. This was after swapping a set of spark plugs, which editor Eric Dahlquist said was a “job [that is] almost suicidal when the engine’s hot.” Yes, the 383 is tight in the Barracuda, which is one reason that the third-generation car was wider (and the front frame rails were three inches farther apart than they were in 1966).

For 1968, the 383 got improved heads, and power rose to 300 (with 400 lb-ft of torque), so quarter-mile times certainly dropped into the 14s, but unfortunately, those times would likely only match the new-for-1968 340 small-block. The engine in this Barracuda has a couple modifications, including a Holley carburetor (replacing the original Carter AVS) and Mopar Performance valve covers and air cleaner.

1968 Plymouth Barracuda Formula S interior through passenger door

When the seller’s dad refurbished the car in the 1990s, he completely changed the color from Matador Red to some shade of “turquoise” and swapped the black interior to white. It looks like a complete job, but I think I’d prefer the original equipment in this case; nevertheless, we can see the console and four-speed shifter from this view.

1968 Plymouth Barracuda Formula S interior with white bucket seats and rear seat folded down

And we can see the Barracuda Fastback’s main selling point: plenty of room for luggage. Barracuda sales were indeed fairly grim in 1968, just 45,412 units, but the fastback (perhaps unsurprisingly) was the best-seller in the line with 22,575 sold. That all comes down to looks, in my opinion. Sadly, the Barracuda was the slowest-selling pony car in 1968, even outdone by American Motors’ new Javelin.

1968 Plymouth Barracuda Formula S luggage compartment

Underneath all that glass was a standard 3.23:1 gear, which is equipped with “Sure-Grip” in this car.

Passenger profile picture of teal 1968 Plymouth Barracuda Formula S with a building in the distance

The Barracuda lost its fender badges during the restoration, but aside from that, it looks complete, and the numbers match (according to the seller). The Formula S was the Barracuda to have back in the 1960s, as it had beefed-up torsion bars, leaf springs, shock absorbers, and a front sway bar. Additionally, this car was ordered with front disc brakes (but no power assist, so bring your leg muscles). While I’d guess that many of us would prefer the stout 340 over the heavier 383, there’s something special about the way a big-block Chrysler sounds, especially when you’re rowing through the gears. Because of that, bidding looks strong, and I’d say that the second-generation Barracuda is more popular now than it was when new.

Related Reading

Vintage CL Road Test: 1968 Plymouth Barracuda 340-S – “Best Yet Of The Barracuda Brigade” (by Aaron Severson)

Curbside Classic: 1968 Plymouth Barracuda Formula 340 – The Worst Selling But Best Pony Car Of 1968 (by Paul N)

Cohort Pic(k) of the Day: 1968 Plymouth Barracuda S Convertible – A Rare And Serious Fish (by Paul N)