The 1974 Plymouth ‘Cuda was the last of the E-bodies, built in a year when the biggest engine on the order form made 245 net horsepower. This one no longer carries what the factory installed: the 360 has been bored and stroked to 408 cubic inches and fitted with three two-barrel carburetors. Read on for what Plymouth actually offered that final year and why builders keep reaching for this combination.
There is a particular sound a fresh engine makes the first time it catches, before anything has been dialed in and while the person holding the throttle linkage is still deciding whether to trust it. On a car built in the final months of the muscle car era, that moment carries a little extra weight. By 1974 Plymouth had already surrendered, the Hemi and the 440 were gone from the order form, and the most potent engine a buyer could specify made a figure that would embarrass a modern family sedan. What is under this hood is not what left the factory, and the difference between the two is roughly fifty cubic inches and three carburetors.
The Last Barracuda Off the Line
Plymouth ended Barracuda production on April 1, 1974, which happened to fall almost exactly ten years after the very first Barracuda had been introduced in April 1964. Total output for that final model year came to 11,734 cars, of which 4,989 wore the performance-oriented ‘Cuda badge. Those are small numbers by the standards of the segment’s peak, and they reflect a market that had moved on. Insurance surcharges on high-performance cars, tightening emissions requirements and the fuel crisis of 1973 had between them removed most of the reasons a buyer would walk into a Plymouth dealership looking for something quick.
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What 245 Horsepower Actually Meant
The 1974 ‘Cuda’s top engine was a 360 cubic-inch small block with a four-barrel carburetor, rated at 245 horsepower. That figure looks dire next to the 425 horsepower advertised for the 426 Hemi four years earlier, but the comparison is not honest. The industry had switched from gross to net horsepower ratings for 1972, measuring output with accessories, full exhaust and production timing rather than on a bare engine stand. A meaningful share of the apparent collapse in output between 1971 and 1972 is a change in measurement rather than a change in engine. The rest of it, unfortunately, was real.
The Arithmetic of a 408
Getting from 360 to 408 cubic inches is a matter of two dimensions. The factory 360 uses a 4.00-inch bore and a 3.58-inch stroke. Boring the block thirty thousandths oversize and fitting a crankshaft with a 4.00-inch stroke produces roughly 408 cubic inches inside the same external package. Nothing about the engine bay changes, the motor mounts are untouched, and the accessory drive carries over. What changes is displacement, and displacement is the most reliable route to torque there has ever been. A well-built 408 of this type comfortably makes well over 400 lb-ft without requiring anything exotic.
Why Three Carburetors Instead of One
Six-pack induction is not a Chrysler invention, but the company made it famous. The arrangement uses a small center two-barrel that handles ordinary driving, flanked by two outboard two-barrels that only open under heavy throttle. At light load it behaves like a modest economy setup. At full throttle it flows a great deal more air than a single four-barrel of comparable size. Plymouth offered it on the 440 Six Barrel cars from 1969 and on the 340 in the 1970 AAR ‘Cuda. Putting it on a stroked 360 is simply extending a recipe the factory had already proven twice.
The Engine Plymouth Never Got Around to Building
That combination is effectively the high-output small-block Chrysler could have offered in 1974 and did not. The company had the 340 Six Barrel engineering, it had the 360 block, and it had the demand. What it did not have was any commercial reason to certify a new high-performance engine in the middle of an emissions crackdown while its performance customers were vanishing. Building one now is the hobby doing what it has always done, which is filling in the gaps the factories left when the accountants and the regulators arrived at the same time.
The Parts of the Build Nobody Photographs
A stroker of this size is not a bolt-together proposition. The longer stroke often requires clearancing the block for connecting rod bolt travel, and rotating assembly balance becomes critical rather than optional. Camshaft selection has to suit both the added displacement and the induction, since a six-pack that comes onto the outboard carburetors too abruptly is unpleasant to drive on the street. Linkage setup and progressive throttle tuning consume more hours than the machine work does. The engines that end up genuinely usable are the ones where somebody spent that time rather than chasing a dyno number.
The First Start Is a Real Milestone
Firing a freshly assembled engine for the first time is not a casual event, particularly with a flat-tappet camshaft, which is common in builds of this style. The engine has to be brought up to a sustained elevated idle almost immediately and held there for a set period so the cam lobes and lifters bed in properly, with oil pressure verified before it ever runs. Get that wrong and a wiped lobe can end the project within minutes. It is why builders record the moment, and why the sound of one catching cleanly on the first attempt carries the significance it does.
The Body That Never Got a Second Chance
It is worth remembering how short the E-body’s life actually was. The platform arrived for 1970, carrying the Barracuda and the Dodge Challenger, and it was finished by the spring of 1974. Five model years is nothing in an industry that routinely amortizes tooling across a decade or more. The convertible disappeared after 1971, federal bumper standards reshaped the front and rear ends for 1973 and 1974, and the engine range contracted every single year. Chrysler had built a genuinely beautiful car and then watched the market it was designed for evaporate underneath it, which is why the 1970 and 1971 cars and the 1974 cars feel like they belong to different decades despite sharing a body shell.
Where a 1974 ‘Cuda Sits Today
Values for E-body Plymouths are stratified more sharply than almost anywhere else in the collector market. A documented 1970 or 1971 Hemi ‘Cuda occupies a tier of its own, well beyond what most enthusiasts will ever encounter. A 1974 car, with its smaller engine range, federal bumpers and the absence of a convertible option after 1971, sits far lower. That gap is exactly why these cars make sensible candidates for a build like this one. Modifying a numbers-matching Hemi car would be indefensible. Turning a 1974 360 car into the six-pack small block Plymouth never offered costs nothing in historical value and produces a considerably better car to drive.
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