What is the gap number on valves for a 1600cc engine?

The valve clearances, or "gap number," for a 1600cc engine may vary depending on the specific model and year of the engine. Here are some general guidelines:

- Intake valve clearance: 0.15 mm to 0.20 mm (0.006 to 0.008 inches)

- Exhaust valve clearance: 0.20 mm to 0.25 mm (0.008 to 0.010 inches)

It's important to refer to the specific service manual or manufacturer's recommendations for your particular 1600cc engine to ensure accurate valve clearances. Incorrect valve clearances can affect the engine's performance, efficiency, and longevity.