On Mon, 25 Aug 2008 19:09:32 +0200 (CEST), Bastian Preindl wrote:

> >4,2 cylinder bores are NiKaSil coated

AH- NO. at least for the 32valve engines I'm aware of.

The information from the folks that actually cast the blocks( Kolbenschmidt-Pierburg) indicates that ALL 32 valve
V8 castings were Alumisil ( alloy AlSi17Cu4Mg )
Links-
http://www.kspg-ag.de/index.php?fid=866&lang=3

Motor-Service home http://www.ms-motor-service.com/content_kataloge.asp?area=hauptmenue&site=katalog&cls=02
Catalog of KS technical manuals http://www.ms-motor-service.com/content2.asp?area=hauptmenue&site=technischebroschueren&cls=02

PDF link on reconditioning ALL alumisil KS blocks
http://www.ms-motor-service.com/download/prospekte/KS_50003804-02_WEB.pdf

news article here http://findarticles.com/p/articles/mi_m3012/is_10_183/ai_109505538


Basically if you have access to a machine shop that has the RIGHT equipment (Sunnen VC-20 for example) refinishing ( even after boring)
these engines isn't an issue.
I've rebuilt 2 Porsche 928 engines that use the same ( basically) material- no problems.

Das Buch zum Audi V8