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According to my 1972 Datsun 240z sports model S30 series engine service manual, the specifications are as follows- Distributor point gap: 0.4mm-0.5mm (0.0157 - 0.0197 in.) Distributor initial advance: Note that the pulley groove is graduated 5° per scale division in terms of the crank angle. (Timing mark on pulley is 5° advanced from 0° on crank) L20A engine (2.0 liter): 10°/550 rpm (manual trans) 10°/650 rpm in neutral (auto trans) L24 engine (2.4 liter): Single carburetor: 17°/550 rpm (manual trans) 17°/650 rpm in neutral (auto trans) SU twin carburetors: 17°/650 rpm (manual trans) 17°/700 rpm in neutral (auto trans) SU twin carburetors & emission controls (air pump, etc.): 5°/750 rpm (manual trans) 0°/600 rpm in drive 0°/780 rpm in neutral for reference (auto trans) Hope this helps.

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Q: 240z ignition timing spec
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