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What is the distributor cap firing order on a 5.7 gmc vortec engine?

The firing order for a 5.7L Vortec engine (and most small-block Chevy V8s) is 1-8-7-2-6-5-4-3.

The distributor cap's terminal arrangement will reflect this firing order. However, the *specific* physical location of each cylinder on the cap can vary slightly depending on the year and specific distributor model. It's always best to consult a diagram specific to your engine's distributor cap or a repair manual for your exact vehicle year.