If you have a 305 or 350, it is 1,8,4,3,6,5,7,2.
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All 305 and 350 Chevrolet V8 motors are 18436572
305
1, 8, 4, 3, 6, 5, 7, 2 firing order is stamped on the front of your intake
1-8-4-3-6-5-7-2
1,8,4,3,6,5,7,2 same as the firing order
About 170
1 8 4 3 6 5 7 2 on all gm V-8's
1-8-4-3-6-5-7-2 and it rotates clockwise.
18436572
The firing order for a 305 Chevrolet engine is: 1-8-4-3-6-5-7-2