I have a set of factory GTA pistons with a bore of 79.9 or same as 1750 bore. My audodelta literature shows these size as factory options since many races allowed capacity up to 1700. With the shorter 1600 stroke, a 1750 bore or 80 mm would put you just at or under 1700.
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'60 Giulietta Sprint
'64 Giulia Spider Veloce
'65 Giulia Sprint Speciale
'71 1750 GT Veloce