Cylinder 1 sits on the driver's side (the left bank) of the GM 5.3-liter V8.
Understanding the cylinder-bank layout on the 5.3L
GM's LS-based 5.3L engines divide cylinders into two banks. The side containing cylinder 1 is Bank 1, and the opposite side is Bank 2. This numbering scheme is used across most Chevrolet and GMC trucks with the 5.3L V8 and other LS-family engines.
To visualize the arrangement, here is the standard mapping for the LS-based 5.3L:
- Bank 1 (left/driver's side): Cylinders 1, 3, 5, 7
- Bank 2 (right/passenger side): Cylinders 2, 4, 6, 8
The numbers indicate the relative positions of the cylinders along the engine, with 1 at the front of Bank 1 and increasing toward the rear of the engine on that bank.
How to verify on your vehicle
Depending on your specific model year and engine code (e.g., LY5, LMG), the physical location can be confirmed by inspecting the front of the engine for the cylinder 1 marking or consulting the service manual. In GM's current 5.3L engines, cylinder 1 is on Bank 1—the left-hand side when facing the front of the engine from outside the vehicle.
Summary
In GM's 5.3-liter LS-based V8, cylinder 1 sits on Bank 1, the left (driver's) side of the engine when viewed from the front of the vehicle. Bank 1 consists of cylinders 1, 3, 5, and 7; Bank 2 consists of 2, 4, 6, and 8.