You really should get a repair manual for your car. The firing order for 1988 and later 4.3 liter V6 engines is 1-6-5-4-3-2, number one is driver's side front on the distributor and rotation is clockwise. Number one cylinder on the engine is driver's side front, number two is passenger side front and the rest follow the same pattern.
i am looking for a diagram of the firing order in a 1997 Chevy s10 blazer 4x4.
Call your local parts store and they will be happy to give you the answer.
165432 is firing order I believe the #1 is the lower right if you looking from front of truck
1-6-5-4-3-2 clockwise on the distributor.
18436572
Firing Order: 165432 Distributor rotation: Clockwise 1993 Chevy 4.3L V6 Firing order
165432
165432
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firing order pick up s10 2001
For a 1991 Chevrolet Blazer with 5.0L, 5.7L and 7.4L engines the firing order is 1-8-4-3-6-5-7-2 The distributor rotation is clockwise. Here's a web page with a wiring diagram: http://www.chuckschevytruckpages.com/underhoodwiring.html