Iso Grifo

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Iso Grifo Series I, front view.
Iso Grifo Series I
Production 1963-1974
Manufacturer ISO
Engine 5.4 l ohv-V8 (Chevrolet 327), 300/355 hp
5.7 l ohv-V8 (Ford 351 Cleveland), 365hp
7.0 l ohv-V8 (Chevrolet 427), 400hp
7.4 l ohv-V8 (Chevrolet 454), 395hp
Transmission 4spd Muncie or 5spd ZF manual transmission
3spd automatic (on request)
Length 174.4 in (4430 mm)
Width 69.7 in (1770 mm)
Height 47.2 in (1200 mm)
Layout FR layout
Body style 2-door coupe targa
Weight 3150-3550 lb (1430-1610 kg)
Wheelbase 98.4 in (2500 mm)

The Iso Grifo is an Italian automobile produced by Iso Automobile from 1963-1974.


Iso Spa in Bresso (I) was already well known for producing the extremely well built and fast Iso Rivolta IR300; a sleek looking 2+2 Coupe based on a Chevrolet Corvette power train. After leaving Ferrari, in 1961 Giotto Bizzarrini set up “Prototipi Bizzarrini” in Livorno, Tuscany where he designs for and consults Marques like ATS, Lamborghini and Iso Rivolta. In 1963 he designs the Iso Grifo A3/L (L for Lusso) for Renzo Rivolta who was looking for a follow-up to his Iso Rivolta GT. The body was designed by Giorgetto Giurgiaro at Bertone, while Giotto put his expertise in the mechanicals. Giotto figured there would also be a demand for a race version of the Grifo and came up with the A3/C (C for Corsa) with a dramatic modified alloy body. He later dubbed it his “Improved GTO” as he was the designer for the 250 GTO back when he worked for Ferrari. The engine was moved back about 0.4 meters making the A3/C one of the first front-mid-engined cars ever built. To adjust the timing you actually had to take out a piece of the dash! Both cars were being built simultaneously.

That same year Bertone showed the Grifo A3/L prototype at the Turin Auto Show, while Iso showed off the (partly unfinished) competition version; the Iso Grifo A3/C. Both were an overwhelming success. Although design changes had to be made to the prototype, Iso concentrated on getting the Grifo A3/L ready for production. The car got a light facelift that made it less aggressive but turned it into probably the most elegant looking Gran Turismo (GT) supercar ever produced. This “street” Iso Grifo GL received the fast, modified but very dependable Chevrolet Corvette’s 327 V-8 (5.4 L) engine; either in 300 or 350 hp - coupled to a Borg-Warner 4-speed toploader. These engines were ordered in the US, but were completely taken apart and blueprinted before they were put in; as they did with the Iso Rivolta GT. With over 400 horsepower and a weight of less than 2200 pounds, the vehicle was able to reach speeds over 275 km/h.

While Renzo Rivolta focussed on the A3/L; Giotto tried to promote the A3/C - making for some tension between the two. This meant that the Grifo GL was being produced at Bresso and the A3/C at Piero Drogo’s Sports Cars of Modena under Giotto’s strict supervision. In 1964 the prototype Grifo A3/C raced at Le Mans (Edgar Berney/Pierre Noblet) and wins the GT class while finishing 4th overall, which was an enormous success for the new company. After that success bout 22 examples of the Bizzarrini Grifo A3/C were ever constructed before a disagreement between Renzo and Bizzarrini ended the cooperation.

Parting ways

Finally in 1965 Giotto Bizzarrini and Renzo Rivolta split ways and this set the stage for a separated production of the “street” Grifo GL and the “competition” Bizzarrini A3/C. Giotto refined his A3/C and this eventually turned out to be his famous line of Bizzarrini 5300 Strada’s and Corsa’s. From here on the “Grifo” name was lost in connection to Bizzarrini.

If we follow this parallel line of cars, Bizzarrini continues to build both Bizzarrini Stradas and Corsas and had the alloy bodies (put together with more than 10,000 rivets!) built by BBM of Modena. In 1966 he introduces a scaled down version; the Bizzarrini 1900 “Europa” which is first shown in 1967. Most of these cars got a hot version of the Opel 1900 engine, some are known to have Alfa Romeo engines. Only about 17 Europa’s were ever built, making it one of the rarest of his creations. Even rarer is the Barchetta version, the P538 with only three ever produced. A total of around 155 Bizzarrini Stradas and Corsas were built before Bizzarrini closes down in 1969 after a bankruptcy; all remaining parts and cars were sold off and makes them prone to many “fake”-stories going around. A few fake Stradas and P538s are already accounted for, so a potential buyer should be very discriminating when a Bizzarrini is offered. As of today a TRUE Bizzarrini is one of the most sought after sports cars in the world, not only because of it’s rarity but mostly because of its aggressive beauty.

Production begins

To get back to the “luxury” Iso Grifo, Renzo Rivolta gets awesome reviews about his Iso Grifo GL. The car developed 390 hp in its production form and could hit 110 km/h in first gear! Renzo Rivolta also shows a one-off Grifo A3/L Spyder at the Geneva auto show and because this stayed a one-off this particular car is the most sought-after Iso ever as of today (2006). Its whereabouts are known, but the owner keeps it in unrestored condition stored away from the public. The full blown production of Iso Grifo GL starts in 1965 and customers are very happy with their cars, especially the combination of elegance and performance. In October 1966 the very first Grifo (car #97) with Targa Top is shown at Turin, this by Pavesi built version sported removable stainless roof panels and a zip-out rear window. This was one of 14 Targa’s ever built, a very desirable body style for collectors.

In 1968 the Grifo 7 Litri was introduced, this car got the spectacular Corvette L71 (a Tri-Power version of the famous Corvette 427) Big Block. This (Seven liter) power plant required many changes to the car to fit and a hood scoop was needed because of the height of this engine. It produced 435 hp at 5800 rpm and the factory claimed it could reach a top speed of 300 km/h. This particular, very first 7 Litri is still lost and is subject to many car lover’s dreams. Many think it got scrapped, though.

Stylistic changes

Then, in 1970 a well-overdue styling change is made to the nose section of the car and the Grifo Series II was born. This car got a sleeker look and hide-away headlights. While the original Series I was one of the most beautiful GT’s ever built, the new lines were perfect and the Grifo Series II became a timeless masterpiece with an even more aggressive look. In this new Series II, there were only 4 Targa’s built and when they switched from 427 engines to the newer 454 the IR-9 “Can Am” version was born. This engine was not as fast as the 7 Litri and production stopped in 1972. The Series II 7 Litri are extremely rare, especially with the manual transmission which made them very brutal machines to drive.

In 1972 Iso started to use Ford Boss 351 (Cleveland 4BBL) engines and these cars (Grifo IR-8) are recognized by their taller hood scoop which makes them look very aggressive. This version was the swan song version of the Iso Grifos, Iso Spa had to close its doors in 1974. Main reason was the oil crisis. The Interior of the Grifo didn't change much during all its years of production as it simply was one of the best finished and most beautiful on the market.


All Grifos are extremely desirable today because of their beauty and un-complicated mechanicals, so most surviving cars are either restored or in the process of being restored. A former employee of Iso, Mr. Roberto Negri runs a small Company in Clusone, Italy where Grifos from all over the world are being restored to (better than) original specs. He is booked solid with work until the end of 2012! Grifos are a blast to drive and ready to turn heads at every (Ferrari or Lamborghini) meet! In the end there were 322 Series I and 78 Series II cars built for a total of 400 Grifos, making it one of the most collectible cars known to man. 332 were Series I cars; 90 were 7 Litri, but when it comes to rarity, the Series II 5-speeds and the Big Block Targas are the thing to look for. In any case, connoisseurs from all over the world agree about the beauty of either model and the soaring selling prices (in any condition) prove that fact.

1972 ISO Grifo 7 Litre Canam

1971 Iso Grifo Series 2

ISO S.p.A.
Rivolta | Grifo | Fidia | Lele | Varedo | Grifo 90 | Grifo 96

Bertone Designs
Abarth: 1952 Abarth 1500 Coupé | 1958 Abarth 1000 GT Coupé | 1965 Abarth OT 1000 Spider

Alfa Romeo: 1953 Alfa Romeo BAT-5 | 1954 Alfa Romeo 1900 Sport Spider | 1954 Alfa Romeo 2000 Sportiva | 1954 Alfa Romeo BAT-7 | 1954 Alfa Romeo Giulietta Sprint | 1955 Alfa Romeo BAT-9 | 1960 Alfa Romeo Giulietta Sprint Speciale | 1962 Alfa Romeo 2600 Sprint | 1962 Alfa Romeo Giulia Sprint | 1962 Alfa Romeo GTA | 1962 Alfa Romeo Giulia Sprint Speciale | 1964 Alfa Romeo Canguro | 1967 Alfa Romeo GT 1300 Junior | 1967 Alfa Romeo Montreal | 1968 Alfa Romeo Carabo | 1976 Alfa Romeo Navajo | 1978 Alfa Romeo Alfetta | 1980 Alfa Romeo Alfetta 2000 | 1983 Alfa Romeo Delfino | 2003 Alfa Romeo GT
ASA: 1962 ASA Coupé
Bertone: 1970 Bertone Berlinetta | 1992 Bertone Blitz | 2003 Bertone Birusa
Ferrari: 1962 Ferrari 250 GT Berlinetta Lusso | 1974 Ferrari 208/308 GT4 | 1976 Ferrari Rainbow
Fiat: 1967 Fiat Dino Coupé | 1968 Fiat 850Sport Spider | 1978 Fiat Ritmo/Strada | Fiat X1/9
ISO: 1962 Iso Rivolta | 1965 Iso Grifo | 1969 Iso Lele
Lamborghini: 1967 Lamborghini Marzal | 1967 Lamborghini Miura | 1968 Lamborghini Espada | 1970 Lamborghini Urraco | 1971 Lamborghini Countach | 1974 Lamborghini Bravo | 1980 Lamborghini Athon | 1988 Lamborghini Genesis | 1990 Lamborghini Diablo
Lambretta: 1968 Lambretta Luna line: Lui, Vega & Cometa | 1969 Lambretta GP/DL Scooter
Lancia: 1970 Lancia Stratos Zero | 1972 Lancia Stratos | 1978 Lancia Sibilo
Maserati: 1972 Maserati Khamsin | 1974 Maserati Quattroporte II