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Message: [QUOTE="renegade, post: 881839, member: 7535"] I think most everyone missed the point that Drunk On Diesel made. The crack is caused when the entire stud turns deeper into the block when torquing the studs, depending on the friction between the stud and nut if the stud is finger tight or tighter to being bottomed in the block if the stud turns at all it MAY exert too much tension on the threads in the block causing the crack. I was able to crack a 6.4 block that was magnefluxed to make sure that there where no cracks, one hole cracked with less than 1/16 of a turn additional rotation at 250 lbs ft of torque, the second hole on the same side we broke the stud without cracking the block after very precisely monitoring that the stud did not turn further when torqued, we where at well over 500 lbs ft of torque (the highest reading on my torque recording torque wrench) In my limited number of these I have worked on, all that cracked, the studs where more than finger tight by about 1/4 to 1/2 a turn. 2 of these I known had only been lightly finger tightened. At least 1 of the others had the old ARP lube, 3 others I worked on for other reasons used the new lube and the studs unscrewed with finger pressure and had no cracks. [/QUOTE]

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