GTAm
The 1750 GTAm could produce up to 240 PS with a 1985 cc engine—a car usually related to the GTA, but unlike the GTA derived from the GTV 1750 (US version). The 1750 GTAm (later called 2000 GTAm for marketing reasons, when the 2000 GTV was introduced) was created in 1969. Which chassis were built when is listed in the link to the "Alleggerita" book and "alfabb" website.
There are three schools of thought about the "Am" moniker, neither having ever been officially confirmed by Alfa Romeo:
The car had a full steel body modified with aluminium and plastic parts. Because of a minimum weight increase in 1971 up from 920 to 940 kg, the GTAms had less of a need for lighter-weight aluminium and plastic parts.
The base for the GTAm was the US-market version of the 1750 GTV with a SPICA mechanical fuel injection system. This 1750 GTV US version is known as the Giulia Type 105.51. Autodelta built 1750 GTAms for both the works team and customer teams. They had a chassis number starting with #153XXXX. Most works and customer Autodelta cars had SPICA injection, although a different version was made for racing.
The European market 1750 GTV (with dual carburetors) was also used to build a 1750 GTAm. Some say that the 2000 GTV and the GT 1300 GT Junior bodyshells were used as well. Some racing teams and private workshops also ordered parts from Autodelta and other tuners and assembled the GTAm themselves on a new or existing body shell.
The original 1750 engine block (actually 1779 cc) was used, and inserting a monosleeve instead of four individual cylinder liners increased displacement to 1985 cc and later to 1999 cc to participate in the 2000 cc class, explaining the "maggiorato".
According to the sources, some 40 GTAms were built by Autodelta and by private workshops. This number is difficult to verify, as the GTAms lacked their own specific chassis numbering scheme.
In the second revised edition of the book Alleggerita (written by Tony Adriaensens, Patrick Dasse & Martin Übelher), published in 2012 by Dingwort Verlag in Germany,
A complete and regularly updated list of the 1750 / 2000 GTAms can be found here: https://www.alfabb.com/threads/gtam-chassisnumbers.162337/page-25#post-8807697
- GT Alesaggio Maggiorato (Italian: increased bore)
- GT Alleggerita Modificata (Italian: lightened modified)
- GT America
