Born in Rome into a wealthy family, Giunti began racing Alfa Romeo cars from his teenage years. He came to wider notice in the European Mountain Championship, winning the inaugural production-car class title in 1967 driving an Alfa GTA. On the strength of that result, Autodelta signed him for their 1968 sports car programme. Sharing a T33 with Nanni Galli, Giunti took second in the Targa Florio, fifth at the Nürburgring 1000 km, and fourth at Le Mans — where he and Galli also won the 2-litre class. The 1969 season brought mostly retirements for the pairing, yet Ferrari had seen sufficient promise in his 1968 performances to make an approach.
Signed by Ferrari for 1970 primarily for their sports car effort, Giunti was immediately paired with Nino Vaccarella in the 512S for the season opener. They won the 12 Hours of Sebring outright. At Monza, the pairing pushed the dominant Porsche 917K of Rodriguez and Kinnunen hard before finishing on the same lap; at the Targa Florio the 512S was the first Ferrari home, though outrun by the more nimble 908s of Siffert/Redman and Rodriguez/Kinnunen that Porsche had brought specifically for the narrow Sicilian roads. Through the sportscar season Giunti's performances were consistent enough that Ferrari decided to promote him to Grand Prix racing.
With Jacky Ickx as lead driver having produced little in the first three rounds, Ferrari decided to supplement the team by alternating Giunti with the Swiss-Italian Clay Regazzoni, who was then sweeping the 1970 European Formula 2 Championship. Giunti's Formula One debut came at the 1970 Belgian Grand Prix at the revamped Spa-Francorchamps circuit; he brought his Ferrari 312B home fourth, giving the Scuderia its first championship points of the season. At the French Grand Prix at Clermont-Ferrand he finished fourteenth after a lengthy pitstop to replace a broken throttle linkage. At the Austrian Grand Prix he qualified fifth and remained in contention for a podium before a puncture dropped him to seventh. At Monza he again qualified fifth and ran with the lead group until engine trouble intervened.
The comparison with Regazzoni was unfavourable: Clay qualified higher, scored more consistently, and won at Monza in front of the tifosi. Yet Ferrari re-signed Giunti for 1971, a clear signal that the team regarded him as genuinely capable rather than merely adequate.
On 10 January 1971, during his first race of the new season — the 1000 km Buenos Aires — Giunti was leading in a Ferrari 312PB when, 36 laps into the event, he came upon Jean-Pierre Beltoise's Matra-Simca MS660. Beltoise's car had run out of fuel and he was pushing it toward the pits, cutting across the racing line on the uphill approach to the main straight rather than pushing it alongside the track. The section was blind until the very last moment. Giunti, running immediately behind Mike Parkes's Ferrari and therefore unsighted by the Parkes car when Parkes moved to avoid, struck the Matra at racing speed. Both cars erupted in flames immediately. Beltoise, who had moved to the rear of his car an instant before impact, escaped without injury. Arturo Merzario, Giunti's co-driver who had been waiting in the pits with his helmet and gloves ready, sprinted to the burning wreck but Giunti had died from the impact or very shortly thereafter.
Beltoise was arrested at the circuit, charged with negligent homicide, released on bail, and subsequently had his racing licence suspended for six months. Following extended deliberation, the FIA apportioned equal responsibility — a third each — to Beltoise for pushing his car across the racing line rather than alongside it, to Giunti for overtaking under yellow flags, and to the race organisers whose marshals failed to intervene. Crucially, no regulation at the time prohibited a driver from pushing a car across the track; it was only from 11 October 1971 that the FIA Yellow Book introduced a rule leading to immediate exclusion of a car being pushed along the track. Giunti's death thus produced a concrete regulatory change. He was 29 years old and had accumulated 3 World Championship points from four Grand Prix starts.
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