Firing order and diagram for a 1978 chevy blazer

Deb, all 1985 Chevy Blazers were shipped with a sticker in the engine compartment, which includes a vacuum routing diagram, spark plug gap specification, and firing order. Look around the engine compartment and I'll wager it's still there.

4.3L v6 engine?

Already answered on this site!

Firing order diagram for 1996 blazer 4 3 eng

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Here ya go.

firing order is stamped on intake look at coil packs they should be numbered as well

Here is the firing order diagram for that engine.

For the 1987 Chevrolet Blazer 350 (5.7L):

Firing Order:
1-8-4-3-6-5-7-2

Cylinders:
.......(back)........
|..8..............7..|
|..6..............5..|
|..4..............3..|
|..2..............1..|
........(front)

Distributor Connections:
.....(back)
.....6.....5
3...............7
4...............2
.....8.....1
.....(front)
Rotation:
Clockwise

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heres a diagram 2000 s10 blazer 4.3 engine, hope this helps.

991 Chevy S10 firing order
The firing order for a Chevy s10 depends on which engine you have.
1.9L engine the firing order is: 1-3-4-2 . Distributor rotates counterclockwise.
2.0L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.5L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.8L engine the firing order is: 1-2-3-4-5-6 . Distributor rotates clockwise.
4.3L engine the firing order is: 1-6-5-4-3-2 . Distributor rotates clockwise.

1-6-5-4-3-2
heres a link to help you, good luck.
http://images.google.com/imgres?imgurl=http://www.2carpros.com/forum/automotive_pictures/170934_firing_order_1.jpg&imgrefurl=http://www.2carpros.com/forum/1998-chevy-blazer--spark-plug-wires-vt257725.html&usg=__mEuwyzlUpS9OE3hDhooTkWaPA7s=&h=260&w=278&sz=15&hl=en&start=1&um=1&tbnid=FCT3-hbHWraurM:&tbnh=107&tbnw=114&prev=/images%3Fq%3D1998%2Bchevy%2Bblazer%2Bfiring%2Border%26hl%3Den%26sa%3DN%26um%3D1

Haven't got a picture currently but firing order is 1,5,3,6,2,4.
cylinders are 1,2,3,4,5,6 from front to back. You should be able to use distributor & rotor position, at TDC to get where you want to be. Rotor turns clockwise. As long as you remember roughly where vacuum advance was pointing.