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Message: [QUOTE="bigrpowr, post: 1010052, member: 806"] actually, ARP did no R&D . none. and certainly never installed them in an engine and fired it. their original tq value was based simply on 3 things which are the basis for all bolts and fasteners which is size, material, and lube. just think they started their sets for the 7.3 at 90 ft/lbs , in just 6 months after countless headgasket failures, they had gone all the way up to 140 , and that was with NO r&d as is usual with most fastener companies. [/QUOTE]

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