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My pulley doesn't have Z1 on it either. But the logic will tell you that the first mark to hit the case line has to be your advanced BTDC timing mark? That only leaves one mark.
You already know, but advancing your idle timing will give you better off-boost performance, but also advances your max timing same amount.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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