Just a thought...
Brett, not sure what job you're doing, but if the cam box is off (or needs to come off the head), then do you need any special tools? The 15mm/17mm head bolts would imply torque to angle types so don't need re-torqueing once you've done a few miles - this means you can sort the head bolts before putting the cam box back. Only if you pre-assembled the cam box to head (eg to sort the clearances at your bench) would make the special tools necessary once you got to the engine. Chances are the cam box base gasket has a leak and your clearances are out in any case, so taking the housing off is on the cards. I might of missed something though :hypno: