Anyone know what the diameter of the shims is? My dealer is refusing to tell me (knows doing the work my self).
I'm think 7.48mm
If you follow the 650 valve shim post on this forum, you will discover that many of us just sand the shims to the size we need, that many shims are not what the value as listed when you buy them. The most important is the tools you use, go no go feeler gauges and a 3 decimal micrometer . There is a whole list of tools needed in those posts, Between my posts and fast Eddie, over 6 valve shims have been done using this method, one huge advantage is I set all my clearances at maximum clearance by sanding, some have commented on case hardening, no worries , you will never reach the depth of the hardening, also there is no wear on these as they are truly a spacer.
Also FYI, make sure you do the checking per bucket / shim, 1 at a time or make sure you use something like a egg carton to make sure the bucket return to their original location, the bucket shim combo needs to be observed as like each shim the total thickness of the buckets is not identical.Others have purchased shims to find the dimension stated is not what is measured, usually you have tight valves so the existing shim is too thick, some have been able to swap shims between valve locations, this can lead to making mistakes. The other thing that some have done is take the tight shims to the dealer with your micrometer and swap with the service department with the measured values you need, not all shops are willing to do this, for me it is a PITA, since the drive to and from the dealer equals my total time in sanding all the shims, minus all the frustration at the dealer