Cylinders are numbered from the front to the back - 1-4 on the passenger side, 5-8 on the driver side. Firing order is 1 5 4 8 6 3 7 2, which is 1 4 6 7 on the passenger side and 5 8 3 2 on the driver side. The inside of the distributor caps are marked with the numbers - R if using on the right / passenger side, L if using on the left / driver side.