Minimum cylinder wall thickness?

[4v6]

Does anyone have a guide on whats an acceptable minimum cylinder wall thickness for a turbo application?

The engine in question is a 5 cylinder diesel block with a bore diameter of 79.5mm.
This particular block comes from VW's T4 transporter van and has a 95.5mm crank throw which I want to run as a petrol application, enlarging the bore to a more useful 82.50mm, which should give a displacement in the region of just over 2.5litres.

Ive had a look in the usual places with some suggestions ranging anywhere from 60 thou to over 200 thou, so quite a varied range.
Obviously Ill need to have the block sonically checked to ensure its already usable.

Any help appreciated.

[4v6]

Thanks for all the replies fellas, looks like the AAB block goes in the skip then and ill start with the AEL or AAT.