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Since the 403 is an Olds engine, the firing oder is the same as any GM 8 cylinder (1-8-4-3-6-5-7-2), HOWEVER the distributor rotates COUNTERCLOCKWISE. Make sure you identify this before proceeding with installation of wires to cap. Make sure distibutor is lined up with #1 cylinder and it is TOP DEAD CENTER, firing and make sure the timing mark on the crank is a "0". I use a long screwdriver to "eyeball" the #1 tower on the cap to the #1 cylinder (should "point" to it when layed down). Try to get this as acurate as possible. If it is not lined up perfectly, removed and reinstall distibutor until it is damn near bang on. Car should fire up with very little adjustment of the distributor. After, take car out for a good run and advance distributor just until it starts to "ping", then back off a hair!!! You're now on your way to peek engine tuning.
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