Chevrolet V8 engines use a two-bank layout where the left bank (driver’s side) carries cylinders 1 through 4 and the right bank (passenger’s side) carries cylinders 5 through 8, with 1 and 5 at the front of each bank. The common firing order for these engines is 1-8-4-3-6-5-7-2.
This numbering convention helps technicians identify cylinder locations, wire routing, and timing relationships across Chevy V8 families. While the general pattern is consistent, the exact orientation can vary between engine families (small-block, big-block, and LS) and model years, so it’s essential to consult the specific service manual or a block diagram for your engine to confirm the arrangement.
Bank layout and numbering
The two-bank arrangement means each bank is numbered front to rear. On a typical Chevy V8, the left (driver’s) bank contains cylinders 1–4, and the right (passenger) bank contains cylinders 5–8. Concretely, 1 sits at the front of the left bank, followed by 2, 3, and 4 toward the rear; 5 sits at the front of the right bank, followed by 6, 7, and 8 toward the rear.
- Left bank (driver’s side): 1, 2, 3, 4 from front to rear
- Right bank (passenger side): 5, 6, 7, 8 from front to rear
This front-to-rear mapping on each bank is what technicians rely on when identifying cylinder locations, wiring patterns, and timing marks. Always verify against your engine’s manual or a stamped diagram on the engine block to avoid mistakes when diagnosing or rebuilding.
Firing order
The firing order is the sequence in which each cylinder fires during operation. For most Chevrolet V8s, the standard firing order is:
- 1
- 8
- 4
- 3
- 6
- 5
- 7
- 2
This sequence ensures balanced operation and proper valve timing across the two banks. When setting spark plug wires or diagnosing misfires, this order is the reference point you’ll typically rely on.
Variations by engine family
While the general two-bank concept and the 1–4 / 5–8 distribution are common across Chevy V8s, there are variations in labeling and orientation depending on the specific engine family and year. Always check the exact manual or a reputable diagram for your model to confirm which cylinders correspond to each bank and their front-to-rear position.
LS-series specifics
LS engines, like other Chevy V8s, use eight cylinders with a two-bank layout and the standard firing order of 1-8-4-3-6-5-7-2. However, some diagrams label bank orientation differently when viewed from the front of the engine, so rely on the engine’s stamped diagrams or the service manual to confirm which side carries cylinders 1–4 and which carries 5–8 for your particular variant (LS1, LS3, etc.).
Summary
Chevy cylinder numbering on V8s follows a two-bank pattern: left bank (driver’s side) is 1–4 and right bank (passenger side) is 5–8, with 1 and 5 at the fronts of their banks. The typical firing order is 1-8-4-3-6-5-7-2. Exact orientation can vary by engine family and model year, so consult the specific manual or a labeled diagram for your engine to ensure accuracy.