Is cylinder number 1 on a 5.7L Silverado when sitting in the truck looking out left front or right side?

When sitting in a 5.7L Silverado and looking at the engine bay from the driver's seat (left front), cylinder #1 is typically on the passenger side (right front). However, it's always best to double-check your specific engine's firing order diagram as there might be minor variations depending on the year. The diagram will be in your owner's manual or available online by searching for your specific year, make, and model.