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The firing order should be stamped on the intake if its a stock intake manifold. I'm going to assume it is a v8 model. The firing order is 1-8-4-3-6-5-7-2. You can find a bit more info on the topic here: http://www.classiccarauto.com/impala/how_to/firing_order.shtml

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18y ago

What else can I help you with?