OEM Cam Chain sprocket

You're 3839.4 Km west of me and your smoke has us stuck inside!! 

We British Columbians have had smoke blown up our asses for years, by Ottawa.  Consider this "payback" !    
Yesterday there were carbonized Pine-needles falling from the sky !  

Valves-n-Seats ?  I'm taking the head, cyl-block, pistons, valves and valve-springs to the machine shop. (check the valve-springs for the correct specs).  I'll repeat my valve clearance concerns to them again !