The cylinders on a Chevy 4.3L V6 (also known as a Vortec 4300) are numbered sequentially from the passenger side (right side) of the engine to the driver's side (left side), starting at the front.
Therefore, the firing order is: 1-8-7-2-6-5-4-3 However, the *cylinder number* sequence for identification purposes is simply 1, 2, 3, 4, 5, 6, 7, 8 as described above.
