Damper failures can cause a crank and block failures.
Late 6.2 production used the 599 block and may have even seen some 929 blocks too.
The cranks in the late 6.2 are identical to the 6.5 as are the rods. The pistons in the 6.2 weigh the same as the 6.5 pistons so the rotating assembly is all the same.
Generally unless there are special cicumstances a used block that is crack free, will stay that way.
A high mile block thats been subjected to repeated duty cycles is done moving around and is stable.
Much of the reason for the 6.2/6.5 blocks cracking lies not in the failures of this or that but, with the blocks being unstable (read this as NOT CURED) I have seen cracks in the mainline at the cap register fits that have opened up over 1/16"
Now this sort of shifting can only be caused by a green casting thats shifting and moving during heating and cooling.
A poor choice of metalurgy may certainly be a part of it too.
Just a FWIW, adding the little angle steel girdle goodies to the center mains has little worth in stopping the main webs from cracking. IMHO its more of a warm fuzzy feel good item than a real structural improvement.
In looking at the huge heavy cast girdle that's in the P400 one can see what the engineers were after. The small steel items does not address the root cause of the failure and only ties the center caps together in a fore and aft direction which does little to really stabilize anything much.
The P400 has all 5 of the main caps tied into the nearly 4 inch thick casting that forms the outer periphery of the girdle, that in turn is indexed into the block at the registers and then bolted to the block skirt.
The same thing could have been accomplished by a total redesign on the block in the form of a deep skirt design such at the Dmax or the old Ford Y block 427 engines.
Deep skirts with cross bolted center mains is the answer.
I dont know why that the AMG/GEP engineers did not redesign the block and instead chose to add the girdle as an add on ???
Anyway
If you have a crack free block, it will most likely stay that way now.
Enjoy
Missy
