You can also do them "on the rock" when no 1 is at tdc with inlet valve just opening and the exhaust jut closing on the overlap then adjust no 4 , and visa versa , and when no 2 on the rock do no 3 and visa versa .

If you go here

http://www.kentcams.com/info/catalogue_lowRes.pdf

then you will see on the cvh cams there is slightly different clearances required 0.15/0.20 mm for CVH26 and 0.56/0.61 for CVH27/28

Hope that does not cause to many problems .