1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 898Get this manual
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IGNITION SPECIFICA TlONS
7500-1 0,500 53-63
Re sistor (Oh ms )
Refer toTuneup Spe cific ation s"
Spark lug Type Spark Plug Gap Po int Dwell Point Spring Te