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The studs you are looking for are recessed into the heads. They have barrel nuts on them with a 10mm allen head on them. One is right next to the spark plug, the others are at the 3 other "corners" of the cylinder. A visual check that the barrel nuts are still there is probably all you need. If you want to do more you can try to torque them but usually they are rusted on pretty tight.
-Andy
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72 Carrera RS replica, Spec 911 racer
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