Compression Ignition Addict
Join Date: May 2010
Location: New Market, AL
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I have been a stress/structural engineer for 10+ years in the aerospace industry. Head bolts/studs are essentially tension bolts, and our rule on aircraft assembly line is that once tension bolts have been torqued once they are trash if they come off. Especially if they have actually seen service. If the studs have ever been overloaded to the yield point they will not be as good. Metal is not as elastic after it has been yielded once so torquing it to the recommended spec will not yield the same preload in the bolt leading to possible head leaks.
2005 F250 FX4 6.0 Powerstroke CC SB; No Cat; High Idle Mod - TOTALED!
2005 F250 Lariat 6.0 Powerstroke CCSB; Scangauge II
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