i have just tried to get the drill in and it wont go as the rad is in the way...i want them out to fit a heat shield. but if i carnt get em out it dont matter lol.
and had bloody wasps and bee's trying to attack me :S
As jowley said. Sounds to me like you may need to drop the manifold out to get proper access to them though. If its not important i wouldn't go through all the trouble personally.