The timing marks for a Chevrolet 4.3 V6 engine are located on the front of the engine block, near the crankshaft pulley. There are two timing marks, one for the intake valve and one for the exhaust valve. The intake valve timing mark is a small notch on the edge of the block, and the exhaust valve timing mark is a small hole on the edge of the block. The timing marks are aligned with the corresponding marks on the crankshaft pulley when the engine is at top dead center (TDC).
To find the timing marks on a Chevrolet 4.3 V6 engine, follow these steps:
1. Remove the serpentine belt.
2. Remove the crankshaft pulley.
3. Look at the front of the engine block. You will see two small marks, one for the intake valve and one for the exhaust valve.
4. Align the timing marks with the corresponding marks on the crankshaft pulley.
5. Reinstall the crankshaft pulley and serpentine belt.
The following table shows the timing mark locations for a Chevrolet 4.3 V6 engine:
| Cylinder | Intake Valve Timing Mark | Exhaust Valve Timing Mark |
|---|---|---|
| 1 | 12 o'clock | 6 o'clock |
| 2 | 10 o'clock | 4 o'clock |
| 3 | 8 o'clock | 2 o'clock |
| 4 | 6 o'clock | 10 o'clock |
| 5 | 4 o'clock | 8 o'clock |
| 6 | 2 o'clock | 6 o'clock |
