rubjonny's "guide" is a Haynes tune up procedure made easy. In order to reach that far, and based on your complaint when fitted the G60 head is the engine is now running, smoothly on all 4 cylinders?
RJ is at his tea. But fortunately he made this excellent thread previously. Have a read while RJ enjoys his dinner. http://clubgti.com/forum/showthread.php?t=219775