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Head Stud tightening

Engine

Vehicle Information: Model: 911; Year: 1969; Body Type: Targa; Engine (type, size, modifications): 2.7, RS (8.5:1) Pistons, Solex cams, electromotive, webers.; Total Mileage: 200 on this engine;

200 miles after building the engine, I went in to tighten head studs and adjust valves. I fund all my head studs had loosened since the engine build. I retightened in the proper sequence and proper specs (I have case savers and Raceware studs, nuts, and washers). Is this likely to be a routine maintenance issue for a while after a build, or is it over the first 1000 miles or so??

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