3.0 The GTV 6 3.0 was billed as the most powerful production sports car ever built by Alfa Romeo, the car was a co-operative effort by Alfa Romeo South Africa and Autodelta. The car was developed mainly for racing, so only 200 had to be built for homologation. To compete with the BMW 535i, with a 3.5 litre engine, the new 3 litre engine was installed. It won its debut race in the Lodge Group One International two-hour race at Kyalami 1983 and after that it took 1st and 2nd place in the Group One class of the Castrol three hour race at Killarney and Index victory at the World Endurance Championship 1000 km Race at Kyalami in December 1983. The engine displacement is 2934 cc, with bore and stroke both increased to . The fuel injection was replaced by six Dell'Orto carburettors (as used on the Alfa 6) as the aim was low-end torque rather than peak power. Power increased to at 6700 rpm. The gearing was lowered but the 3.0 still reached a higher top speed of . Acceleration times are 8.36 seconds from 0–100 km/h and 7.2 seconds for 0–60 mph. On the outside, the different induction system of the GTV6 3.0 required a new GRP hood with a prominent bulge. North American market The four-cylinder coupé was available from 1975 to 1977 under the moniker Alfetta GT, renamed the Sprint Veloce for the final two years of availability in 1978 and 1979. The Sprint Veloce received an engine upgrade as Alfa Romeo were coming to grips with the American emissions regulations, with power increased marginally to at 5,000 rpm from at 5,500 rpm. The engine was catalyzed and had a new intake manifold, based on alterations originally developed for California-market cars. It was one of Road & Track's 10 Best Cars For a Changed World. Finally, the V6 version was marketed from 1981 to 1986 as the GTV-6. For the US market, two limited production GTV-6 models stand out. The GTV6 Balocco (named after the famous Alfa Romeo's Balocco test track in Italy) appeared in 1982 with a production run of only 350 cars. The Balocco was available only in red with sunroof and black interior, leather-wrapped steering wheel and red piping on the seats. There were also two green Quadrifoglio badges fixed on the rear quarter trim pieces above a badge with the "Balocco SE"