911 engines have a habit of breaking or pulling head studs. Head studs are long studs that screw into the case. the cylinders slip over them, then the heads and barrel nuts on the ends of these studs are used to hold the heads and cylinders down onto the case. There are four head studs, and four barrel nuts per cylinder. 4 x 6 = 24. My car has 23 barrel nuts (meaning that one of my studs is broken). As a consequence, I will spend lots of time and money this fall or winter rebuilding the top end of my motor.
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'83 SC
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