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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 1008718, member: 8143"] We torqued a lot of them to 325 before the 275. Now we do 250. None of ours cracked at 325. But others did. Some still cracked at 275. The castings aren't perfect. 250 is plenty. With an arp 2000 @ 250# on a 16mm stud at 4 per cylinder with the thread pitch they have it should be capable of holding way more than any sub 2000 hp engine could ever muster the cylinder pressure to stretch. (Whew long sentence) That means that the studs won't move. Still doesn't hold up for sealing surface and proper gaskets as they play a big part too. But I can tell you it would be nearly impossible to stretch an 4 arp 2000 16mm studs over the surface area of a 3.87" bore at any street drive-able power level. I've seen at least two cracked block torqued to 275 with known good wrenches at very reputable shops and still cracked. So I can't say it's just the torque. The blocks are weak in that area and some are weaker than others. [/QUOTE]

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