The most powerful American production car engines of all time
Internal combustion engines are far more complex than electric motors, and it’s correspondingly more difficult to make them produce a lot of power.
As the 2011 horsepower Lotus Evija demonstrates, the most powerful cars of the near future will be EVs, but remarkable outputs have nevertheless been achieved with engines fuelled by petrol or diesel.
Here we’re looking at 20 of the strongest examples created in the US, all of them available in cars or non-commercial trucks sold to the public for road use (so no 11,000 horsepower Top Fuel dragsters, for example).
They’re listed in ascending order of their quoted outputs, with the caveat that there was a change from gross to net horsepower in 1972, which muddies the waters considerably.
Only the most powerful unit from any family is included. This means that what you’ll be reading isn’t a top 20 in the usual sense, since many engines have been ignored because they are outpowered by close relatives, but it adds variety, and we all like variety.
Chrysler FirePower: 390 horsepower (gross)
The FirePower was the first of three generations of Chrysler V8 engine collectively known as Hemi. Introduced in the 1951 model year, it was the only engine fitted to the first four models in the 300 letter series, each of which was produced for just a single year.
It was discontinued after the 300D of 1958, in which it produced 380 horsepower from 6.4 litres if fitted with twin four-barrel carburettors. Optional fuel injection raised the output to 390 horsepower, the highest achieved in any FirePower.
It’s important to note that this was a gross figure, measured when the engine was not burdened by power-sapping ancillaries necessary for it to function in a car. The net figure, as used from 1972 onwards, would have been lower, but still comfortably over 300 horsepower.
Chrysler RB: 400 horsepower (gross)
The RB was a big-block V8 offered in capacities of up to 7.2 litres, but the most powerful version fitted to a road car measured 6.8 litres. This was used in the 300F of 1960, in which it normally produced 375 horsepower gross. As an extra-cost option, customers could order a 400 horsepower version, which was mated to a four-speed manual gearbox rather than the usual three-speed automatic.
The highest gross figure for a 7.2 was 390 horsepower. The Max Wedge variant was rated at 420, but this was intended only for use in drag racing.
Ford MEL: 400 horsepower (gross)
The MEL (which stood for Mercury-Edsel-Lincoln) was Ford’s rival to the contemporary Chrysler RB. In 7.0-litre form it was easily capable of producing 360 horsepower, which was the standard output of the Mercury Park Lane.
In 1958, however, Mercury offered an uprated version with three two-barrel carburettors. Known as the Super Marauder, it produced 400 horsepower, and was an option on every model Mercury sold in that year.
Oldsmobile Rocket: 400 horsepower (gross)
In 1970, the final model year of the first-generation front-wheel drive Toronado, Oldsmobile created the optional W-34 package to boost the output of its second-generation V8, which by that time had reached its maximum capacity of 7.5 litres.
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