Here's a funny story about a 75 Turbo with an Evo engine in Greece; happened about 10 years ago...This car comes in and wants a full rebuild. The garage orders the usual stuff and upon trial fitting the new pistons in the old liners (?) they can't put them in! They almost got in a fight with the parts people and took all of them a while to figure what the hell was going on. Good thing I happened to drop by that afternoon...Nobody knew the Evo had a bore of 79.6mm and not 80mm like the std 1.8T. This gave a capacity of 1762cc in order to fall just short of the 3liter class when multiplied by 1.7 (the turbo factor back in the 1987 days). Needless to say, the car in question was rebuilt with the std 80mm pistons/liners and all was well! However, those Evo engines (06158) had beefier blocks and bearing caps -so says Alfa!