4.6l isn't a v6, its a v8. ive never heard of any sierra coming in a v6 model to begin with. as for the firing order...18436572 is what mine is and i have a 1990 sierra 1500.
Mike's answer... I have a 1994 Sierra 1500 that came with a 4.3l Vortec V6. It was a very common motor in the 1/2 ton trucks. My brother in law has a 1992 with the same motor. Mine has 325,000 miles on it. The firing order is stamped on the intake manifold.
Ray's answer....If it is the 4.3 the firing order is 1-6-5-4-3-2 with clockwise distributor rotation.
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