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A torque to yield bolt is designed to take advantage of a certain plasticity, once torqued, it won't return back to it's original size. It started basically in the 80s with mainstream aluminum heads.

There are also other terms like torque-to-angle, and a few others. In the end, it's a bolt designed to be used once, generally torqued, then turned an additional amount afterwards and left alone. When removed, you toss them

https://en.wikipedia.org/wiki/Torque-to-yield_fastener
 

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Engine doesn't really smoke at all anymore, maybe it did the first time because it was sitting awhile. I'm leaving on a deployment soon, so I'll take it apart and inspect it when I get back next year. I'm just curious to see where exactly the problem is.
 
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