modified with aluminium and / or plastic parts. Because of an increased minimum weight in 1971, up from , the GTAm's had less need for aluminium and / or plastic parts. The base for the GTAm was the 1750 GTV with a SPICA mechanical fuel injection system. The majority of the genuine GTAm's built by Autodelta have a chassis number starting with 105.51.XXXXXX. The European market 1750 GTV with dual carburettors from Dell'Orto or Weber carburetor and chassisnumbers starting with 105.44.XXXXXX was also used as a base. The same goes for the 2000 GTV and the 1300 GT Junior bodyshell that was lighter. Note that some racing teams and private workshops ordered the parts from Autodelta and other tuners and assembled the cars themselves on a new or existing bodyshell. The original 1750 engine block (actually 1779 cc) was used and by inserting a monosleeve instead of four individual cylinderliners, received and later to to participate in the 2000 cc class, explaining the "maggiorata" (enlarged). According to the sources, some 40 GTAm's were built by Autodelta and by private workshops. This number is difficult to verify as the GTAm's didn't have their own specific chassis number series. In the second revised edition of the book `Alleggerita` (written by Tony Adriaensens & Patrick Dasse), published in 2012 by Dingwort Verlag, GTA-SA The Giulia 1600 GTA-SA (sovralimentato ) (1967–1968) was a very rare racing car, which only 10 were built. Car featured 1570 cc twinspark engine with two oil-driven superchargers and it could produce up to at 7,500 rpm. The GTA-SA was built for FlA Group 5 racing in Europe and it won first place overall in the Hockenheim 100 mile endurance race in 1967 in the hands of the German driver Siegfried Dau. In the Netherlands, Rob Slotemaker and Nico Chiotakis also drove GTA-SA. Racing success Both types, the GTA/ GTA 1300 Junior and the GTAm were very successful, and these cars were driven to numerous victories. In the opening season at Monza, they won the first seven places. Andrea de Adamich claimed the ETCC title in 1966. The GTA won the European Touring Car Championship (ETCC) also in 1967 and 1968. The later Alfa Romeo GTAm won further ETCC titles in 1970 and 1971 The 1750 GTAm and the 2000 GTAm cars were driven to victory by Toine Hezemans, who won the 24 hours of Francorchamps with this car. These