Heh,ive always used a brown roloc abrasive disc on sander/cutter.. havnt had any problems so far knock on wood. we've even had a 6.0 head machined .002 of an inch and still didnt cause any problems...could have just been lucky,but ive gone on to make a point on a cracked head and used 2 discs in...
Yea,ive seen your pix 6l pwr. the first reason i came to this site haha....nice egts on that pass eh? had a 6.4 look similiar to that not too long ago.
Well how they all went out sep and didnt go out together, its the actuators. go ahead and buy all 4,not that hard to put in as long as you have small hands