What is the firing order on a 7.3diesel f350?

the year is 1990

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On a Ford F-350 , 7.3 liter Diesel V8 engine :

The firing order is ( 1 - 2 - 7 - 3 - 4 - 5 - 6 - 8 )

The engine cylinder locations are numbered :

firewall

7 - 8

5 - 6

3 - 4

1 - 2

front of vehicle