Went to install the cylinder studs last night only to realize that with the decking and eliminating of the head gasket I going to have to shorten the brand new OEM (and freshly plated) studs about 3mm if I want to use acorn nuts. While mulling that over and realizing that even extra tall acorn nuts wouldn’t cut it, I remembered that the YZ engine uses dowel collars. Given that the Tri-Z is famous for head leaks and that the YZ was getting the newest upgrade I decided to drill the Selvy head to suit. Kind of a scary process knowing what it would take to replace it.
After finishing, and realizing that the collars don’t fit the factory holes in the cylinder very tight it occurred to me that they are more so to hold the gasket in place. No matter, it’s done and the head has way less movement on the cylinder than it did.