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Taken from 101 projects
" If two studs break on the same head, then it’s definitely time for an immediate rebuild. In addition, if you can hear an exhaust popping noise when accelerating, it’s time to rebuild. Driving the car with an exhaust leak can cause the head and cylinder to vibrate and knock against each other. If this problem is left unresolved, then the exhaust leak can end up damaging the head and the piston. In general, if you have an exhaust leak at the junction between the head and the cylinder, it’s best not to drive the car."
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