1, 8, 4, 3, 6, 5, 7, 2.
18436572
18436572 clock wise
I believe it is like all chevy's 18436572
1-8-4-3-6-5-7-2
1 8 4 3 6 5 7 2
400 Chevy engine back firiung exhaust carburtor
The firing order for the Pontiac 400 engine is that the small block powers the big block.
1 8 4 3 6 5 7 2 is the order on the car im working on same as a Chevy but counter clockwise
the firing order for a Pontiac 400 v8 from 1967-77 is 1-8-4-3-6-5-7-2
1,3,7,2,6,5,4,8 Counter-clockwise.
265, 301, 307, 326, 350, 389, 400, 421, 428, 455 all have the same firing order 1,8,4,3,6,5,7,2 the 2.8 firing order is 1,2,3,4,5,6
13726548 counter clockwise