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they were tqed beond the streaching point the first time you tqed them they are no good according to dodge... many have had sussess reusing some have failed...
I reused mine after a week of use. Did not torque them to spec though, as I did not have a torque wrench. All in all, the 90* at the end makes it fool proof for failure. Just do it an rest easy.
i have never bought a new set of head bolts....no problems yet
i asked one of the mechanics i know at the dealership, who is also a neon enthusiest, about the head bolts a week or so ago...he said that the bolts are actually made to be re-used 1 time, but no more then that