If you have the M103 manual, refer to the following job:
05-2190 - Removing and installing rocker arm bearing bracket.
In it, it is recommended that you replace all the rocker arm bearing bracket bolts with 73 mm long ones (the current ones in your vehicle are 70mm long) to avoid stripping the threads (refer image below)
Also, per item number 01-4192 of the M103 manual, it is recommended that you install helicoils on all the rocker arm bearing bracket bolt holes in the cylinder head (size = M8x1.25). This will be cheap insurance against thread strippage when you are putting the head back together (refer attached pdf below)
Here is a thread discussing stripped rocker arm bearing bolt threads stripped:
http://www.peachparts.com/shopforum/showthread.php?p=1291085#post1291085
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1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold
