My machine-shop has told me I need ALL new valves. The machinist actually working on my head and cyl's wasn't in to work yet when I talked to the shop foreman so I have yet to learn why my valves need replacing.
Several exhaustive searches for replacement valves has proven to be challenging.
I have had one reply from Germany and am waiting on a more definitive answer from them. My concern at this moment is regarding a possible difference between the "Z", "ZN' and KZ valve design and specs. I came across a comment "somewhere" that there is a difference.
Obviously I don't want the machine shop to tell me my NEW valves are incorrect, so am hoping for an independent answer from someone who can qualify this.
Thanks