Don't know off hand, but it should be molded into the intake manifold.
1-8-4-3-6-5-7-2
The firing order for a 1970-76 455 should be 18436572 Enjoy!
Answer Anonymously What is the diagram and firing order for a 76 Pontiac trans am 455 engine?
google firing order for a 455 olds and it will bring it up
18436572 COUNTER CLOCKWISE
18436572
The answer to the question is 1-8-4-3-6-5-7-2 for a 455 olds engine. Firing order for an olds 455 engine is 1-8-4-3-6-5-7-2
Fig. 4: 1970-74 Oldsmobile-built 350, 455 V8. Engine firing order: 1-8-4-3-6-5-7-2. Distributor rotation: 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
1970-76 455 should be 18436572
18436572 #1 is drivers side, closest to the radiator.
1-8-4-3-6-5-7-2
Check out www.v8buick.com. There you will find all the info you need for your engine.