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Originally posted on our previous blog 10/10/13 DennisB WiseAutoTools.com © Summary: Cadillac NorthStar head bolt thread failures are common in 4.0 and 4.6 engines, from 1993 and up. Aluminum blocks which are very common these days are mostly to blame. But what’s the best repair? We look at the GM approved method compared to the Northstar Performance “stud” type repair kit, which has only been used on a relatively small number of vehicles. We looked into studs and question why Cadillac engi …