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Evening, all. 

I am building a 4efte atm, just got a headgasket kit with headbolts (BGA)

As I've been following the torquing procedure, one of the bolts on the second tightening @ 33 lbft never clicked and just kept turning until it snapped?

I thought I was going to have to remove the head and start on removing the bolt but I unscrewed it and the bolt came out still holding onto the bottom half. Quite obviously overtightened. I used an old bolt (which were actually only in the engine for 4 weeks prior to me buying the engine) torqued it up and it was fine.

Is there something that I've done for it to keep on turning past its torque or is this a sign of a weak bolt? 

 

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