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I have a 1991 made craftsman dial back timing light, it works fine with MSD-6 and -7 series boxes. If the light is jumpy, than switch the green and purple pick-up wires that connect to the distributor. Unless you have a degreed balancer (who does?) or like timing tape, the dial back is the way to go. Set the knob to 34 or whatever total timing you want, have your buddy rev up the motor till it quits advancing and hold the rpm's steady, and turn the distributor till the line is on the pointer. Lock down distributor and recheck. You can spend big money on the digital snap-on timing light, but it tells you the same thing.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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