For a number of years, TVRs employed the Rover V8, an all-aluminum mill that began life as the Buick 215 in the 1960s. It was a well-proven, durable motor that made perfect sense for a small sports-car builder like TVR. The upcoming TVR Griffith will use a Cosworth-tuned Ford Coyote V8, like the one you get in a Mustang. The Coyote makes sense for the same reasons the Rover V8 did all those years ago.
The TVR Cerbera used a very different engine. A very, very different engine.
For this car, TVR decided to develop its own V8, and it came up with a 4.2-liter unit with a flat-plane crank and a highly unusual 75-degree angle between its cylinder banks. Very few engines have used a 75-degree configuration, notable examples being the KTM V-twin and the current Acura NSX's V6. No V8s, to the best of my knowledge.
The engine, evocatively dubbed the Speed 8, sounded excellent and cranked out 360 horsepower. A later 4.5-liter version pushed the output up to 420 horsepower. TVR boss Peter Wheeler hoped it'd be an engine the company could sell to other automakers. In this 1995 Top Gear review, Jeremy Clarkson heaped praise on the then-new Cerbera, noting it was "very, very fast" thanks to its big engine, and sub-2500-pound curb weight.
Unfortunately, the engine only stayed in production until 2003, when the Cerbera was killed off. Russian billionaire Nikolay Smolensky bought TVR the following year, and the company hasn't built a car since 2006.
It's pretty amazing that a small company like TVR could pull this sort of thing off. There's a reason most boutique sports-car builders don't make their own engines; it's prohibitively expensive. Instead, they save tons of money by buying preexisting designs from major automakers.
Was this engine overly ambitious? Perhaps, but you've got to respect it and the company that built it.