while taking off the left bank rocker cover i hit the same trouble as every one else,
namely , the oil dipstick tube is fastened to the lower 10mm fixing bolt, this has a 7mm nut holding the dipstick tube bracket to the engine, and removal is required to take out the 10mm cam cover bolt
BUT , you have to remove the dipstick way down in the engine bay , a difficult and troublesome operation,
this is my modification to facilitate removal with minimum damage and effort ,
as can be seen in the picture below, the mounting is to the right of the tube, whilst in place, but moved to enable me to work on it , i took my dremel drill and removed the loop to the right , this created a 'C' shape to the bracket which allows it to be pulled away from the stud allowing the rest of the work to continue,
this has to be done with the left bank cam cover still in place, but this is a good thing as no metal fillings went anywhere near the insides of the engine!!!!
re-fixing is a simple operation , i also installed a new washer to hold the bracket once back in place, and looking at the finished job you would never know it had been cut out, as the washer and nut covers it up....