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I just buy pop-off valve last week and planning to install it this week. Another friend (SL911SC) answer was that was the fuel pump on the way out. Y want to clear any head stud pulled issues because that really wory me, what should i look for: (noise, is the back fire or puff-soud) . Or open the valve cover to check the stud. Maybe I am over reacting, but do not want to hurt the engine!!. Thanks for your time and advices.
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Albert
911 SC 1983 :
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