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The marks on the pulley line up with the case seam or straight up as viewed from the rear of the car. You can only adjust one cylinder at a time for any given crank position. Even though #1 and #4 are at top dead center at Z1, one is at the top of the compression stroke (which is where it needs to be for adjustment) and the other is at the top of the exhaust stroke. Here is how I do it:.
1. Rotate the crank clockwise until you see the intake valve on #1 start to open. Continue to rotate the crank until you get to Z1 or "0" on the crank pulley (the rotor will also point to the #1 spark plug wire).
2. Adjust IN & EX on #1
3. Rotate crank 120 degrees and adjust #6
4. Rotate crank 120 degrees and adjust #2
5. Rotate crank 120 degrees and adjust #4
6. Rotate crank 120 degrees and adjust #3
7. Rotate crank 120 degrees and adjust #5
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