Iso Grifo GL 7 Litri
The ISO Grifo GL 7 Litri represents the absolute pinnacle of the Italian-American hybrid supercar concept pioneered by ISO Autoveicoli. While the standard Grifo used Chevrolet small-block power, the 7 Litri variant featured the legendary Chevrolet 427 big-block V8, producing a thunderous 435 horsepower and 631 Nm of torque that made it one of the most powerful production cars of the 1960s. The car's name, Grifo, means 'griffin' in Italian -- the mythical creature that adorned the car's badges. The bodywork was designed by a young Giorgetto Giugiaro during his time at Bertone, featuring aggressive yet elegant lines with a distinctive front end featuring quad headlights behind Plexiglas covers, a long hood accommodating the massive V8, and fastback roofline that flowed into a Kamm tail. The 7 Litri was distinguishable from standard Grifos by its extended hood with prominent bulge to clear the big-block engine, wider track, and more aggressive stance. The chassis featured a steel tubular frame designed by Giotto Bizzarrini before his acrimonious departure from ISO, with double-wishbone front suspension and a sophisticated De Dion rear axle with Watts linkage providing exceptional handling for such a powerful car. The ZF four-speed manual transmission was the same unit used in various Ferraris and Aston Martins, providing robust gear changes capable of handling the big-block's massive torque. Four-wheel Girling disc brakes with ventilated fronts provided stopping power appropriate for the car's 274 km/h top speed. Inside, the Grifo featured luxurious Italian leather upholstery, comprehensive instrumentation including a large 300 km/h speedometer, air conditioning, and refinement that belied the car's brutal performance. The combination of Italian styling and craftsmanship with American V8 power and reliability created something truly special -- a car that could match or exceed Ferrari's performance while offering the dependability of Chevrolet components. Production of the 7 Litri was extremely limited, with approximately 90 examples built over the model's production run, making it one of the rarest and most desirable Italian supercars of the 1960s. Today, the Grifo 7 Litri commands premium prices that reflect its status as the ultimate expression of the muscle GT formula.
The Grifo 7 Litri is an extremely valuable collector car requiring expert verification. Confirm authenticity through chassis number verification with ISO registries -- many standard Grifos have been fraudulently converted to 7 Litri specification. The 427 big-block is a robust engine with parts readily available through Chevrolet performance suppliers, but verify correct engine number and specification. The ZF gearbox is strong but rebuilds are expensive. Inspect the tubular steel chassis for corrosion and accident damage -- these cars were often driven hard. Check bodywork carefully for accident repairs and rust. The De Dion rear suspension should be inspected for wear in the Watts linkage and trailing arm bushings. Cooling system must be functioning properly as the big-block generates substantial heat. Interior leather condition significantly affects value. Electrical systems are relatively simple but period wiring can deteriorate. A comprehensive pre-purchase inspection by an ISO specialist is absolutely essential given values involved. Provenance and documentation are critical for authentication.
The Grifo 7 Litri was produced at ISO's Bresso facility near Milan from 1968 to 1974, with coachwork by Bertone. Approximately 90 examples were built with the 427 big-block engine, making it significantly rarer than the standard Grifo which used small-block Chevrolet power. The 7 Litri featured a modified hood with prominent bulge to clear the tall 427 engine, wider track, reinforced chassis components, and uprated cooling system. The Chevrolet 427 L71 engine produced 435 horsepower with a single Holley four-barrel carburetor. Some later examples received the LS7 454 cubic inch engine after the 427 was discontinued. The ZF four-speed manual transmission was the same unit used in various exotic cars of the era. All 7 Litri examples were left-hand drive.