I think Maserati Stradale had 11,3 : 1. When I use this 94 mm piston instead dia 92 that engine F430 has and put the heads little down
maybe I can get similar compress ratio.
There is the same piston with three rings.
These pistons used my frieds into his F430 long time ago, but he died three years ago, so I can not ask him...
His brother says this piston is from some Maserati. Thats the whole story.