Howdy Yall,   Finished my summer course yesterday, got back into the garage to get some stuff sorted out with the Z.   So I cleaned out the head with my soda blaster, went through washed it up several times, cleaned oil passages, and the top of the combustion chamber. I also cleaned the valve face, and above the seat up to the stem. Soda blasted the intake ones really well, for the exhaust i used a red scotchbride, with some WD40 in a drill to get the same area clean.