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There are two basic checks, one at 900 rpm idle with the vacuum hose ATTACHED, where it should be 5 degrees After Top Dead Center (ATDC), and very briefly, with vacuum hose DISCONNECTED at 6000 rpm, where it should not exceed 38 degrees BEFORE Top Dead Center. It sounds like you have the timing way TOO much RETARDED at the present time!
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Warren Hall
1973 911S Targa
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