Torque to yield, head bolts...

Mopar Tim said

In 1982 GM used TTY bolts on there "new" diesel engine. Of course it was just a Olds engine made to run on diesel. Had head gasket problems! Imagine that!

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I remember those days. I was a advisor at a Buick/GMC dealer back then. Head gasket issues from 2 different directions. The article I posted the link to explains the clamp force needed for a head bolt. More is needed for a high compression Diesel for sure.