1-8-4-3-6-5-7-2
If it is a 5.7L or 5.0L the firing order is 18436572.
Assuming this is a V-8 engine, 1, 8, 4, 3, 6, 5, 7, 2.
1-6-5-4-3-2
If it's a 350ci the firing order is 1-8-4-3-6-5-7-2
1-8-4-3-6-5-7-2
Clockwise, 1, 6, 5, 4, 3, 2.
Click the link for a diagram
If it has the 5.7L 350 small block, 1, 8, 4, 3, 6, 5, 7, 2, clockwise.
Click the link for a diagram
im getting 17 on the highway on mine
8-16 mpg
ALL Chevy V-8 engines,small or big-block,the firing order is... 1-8-4-3-6-5-7-2 with clockwise rotation of dist. rotor