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If it's the Buick 231 V-6 the firing order should be 1-6-5-4-3-2. If you're running a Chevy 305 it will be 1-8-4-3-6-5-7-2. And if you have the rare California-only Chevy 350 the firing order will be the same as for the 305.

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Q: What is the firing order for a 1986 Pontiac Bonneville?
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