I put the Pertronix ignition and Flamethrower coil on my 170 a couple a years ago and it was probably the best upgrade I've done to it. What Spare said sounds right, I'll have to look at mine tommorrow. I know you don't need the resistor inline anymore, and watchout when replacing the distributor cap. I almost cut my wires the first time.
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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