[jpnovak]

You are confusing two different things.

The 3.0 and 3.2 cylinders are both 95mm. By themselves this does not create a 3.2SS. To increase the capacity of a 3.0 to 3.2SS you need to increase the bore of the cylinder to 98mm. Likewise, if you increase the bore of a 3.2 from 95 to 98mm you end up with a (nominal) 3.4.

The 3.0 cylinders can not be bored to 98mm. The top of the cylinder has a sealing ring. When you cut 1.5mm off the cylinder bore wall the edge of the sealing ring is less than 0.5mm and is not thick enough to support the sealing ring. The 3.2 cylinder does not have a sealing ring. When cut to 98mm they do not have the same edge issue.

Solution. buy existing 98mm cylinders or buy 3.2 cyilnders and have them bored/replated to 98mm.

As for pistons... YOu could use Wossner, JE or CP for pistons. They all make suitable pistons as well as custom options to fine tune your compression ratio, valve pockets and target performance metrics.