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To check the timing, the tan/black stripe wire to the distributor needs to be unplugged. Use # 5 plug wire with the lower timing mark. The factory timing should be labeled on the air cleaner. It is probably 4 degBTDC but 6 to 8 degBTDC should make it run cooler and give it better gas mileage.

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Q: How do you use the lower timing marks on a 454?
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