Iso Fidia V8
The Iso Fidia (also known as the S4) was one of the most ambitious and least known Italian luxury sedans of the 1960s and 1970s. It was Iso's attempt to create a four-door grand tourer that could compete with the Maserati Quattroporte and the forthcoming Jaguar XJ6 — a four-seat car with genuine supercar performance.
Designed by Ghia under the direction of Giorgetto Giugiaro (who completed the design before moving to Italdesign), the Fidia was a large, imposing sedan with clean, modern lines. The proportions were dictated by the need to accommodate four adults in comfort while housing the Chevrolet V8 engine under a long hood. The result was handsome if somewhat anonymous — a car that could blend into traffic more easily than its exotic mechanicals suggested.
The powertrain followed the proven Iso formula: Chevrolet's 327 cubic-inch V8, later upgraded to the 351-cubic-inch (5.7-liter) unit, mated to a General Motors TH400 three-speed automatic transmission. The combination provided smooth, effortless performance — the Fidia could reach 218 km/h while isolating its occupants from mechanical noise and vibration. A four-speed manual gearbox was also available for those who preferred a more engaged driving experience.
The chassis inherited the sophisticated engineering of the Rivolta, with independent front suspension and a De Dion rear axle. This gave the Fidia handling that was significantly more composed than the period American luxury sedans that shared its engine. Four-wheel disc brakes provided stopping power appropriate to the performance.
The interior was luxuriously appointed with leather upholstery, deep-pile carpeting, electric windows, air conditioning, and a level of equipment that matched the best German and British luxury sedans of the era. Build quality was good for a hand-assembled Italian car, though it could not quite match the precision of a Mercedes-Benz.
Only 192 Fidias were produced over seven years, making it one of the rarest four-door sedans ever built. The oil crisis of 1973 effectively killed the market for V8-powered luxury cars, and Iso itself closed in 1974. Today, the Fidia is a fascinating rarity — a genuine four-door Italian grand tourer from one of the most storied names in the industry.
Extreme rarity means very few come to market. The Chevrolet drivetrain is the most dependable element — parts are universally available. Body and chassis rust is the primary concern, as with all Italian cars of this era. The De Dion rear axle is shared with the Rivolta and needs specialist knowledge. Interior trim is bespoke and expensive to restore. Air conditioning and electrical systems are often non-functional and require specialist attention. Verify authenticity through the Iso owners' network. Complete cars with documented history are extraordinarily rare.
192 units were built between 1967 and 1974, making the Fidia one of the rarest production sedans in automotive history. Early cars used the Chevrolet 327 V8; later examples received the 351 (5.7L) V8. The body was originally designed by Giugiaro at Ghia, with some later modifications by other designers. The 1973 oil crisis devastated sales and contributed to Iso's closure in 1974.