Cylinder numbering: 4.9: LEFT bank 1-3-5-7, RIGHT bank 2-4-6-8
Firing order diagram
firing order 1-8-4-3-6-5-7-2. The small number by each cylinder is its place in the firing order. Left and right banks as the maker's manual names them; where the engine sits front to back, left is the driver's side.
Details
Engines
Cadillac High Technology V8: 4.9 read directly; HT4100 4.1 and 4.5 same block family, not read