I haven't got my service book to hand, but a couple of interesting links:
http://www.bimmerforums.com/forum/showthread.php?1511468-Z4-M-valve-clearances
http://www.z4-forum.com/forum/viewtopic.php?f=9&t=48642
http://www.bimmerfest.com/forums/showpost.php?p=2760482&postcount=21
Looks like most people expect them.
As having valves out of tolerance can cause horrid issues I'd insist on getting them checked. A lot can happen in 4+ years.
http://www.bimmerforums.com/forum/showthread.php?1511468-Z4-M-valve-clearances
http://www.z4-forum.com/forum/viewtopic.php?f=9&t=48642
http://www.bimmerfest.com/forums/showpost.php?p=2760482&postcount=21
Looks like most people expect them.
As having valves out of tolerance can cause horrid issues I'd insist on getting them checked. A lot can happen in 4+ years.