IGNITION Timing Marks

[Rick Allen]

A little bit confused about the correct mark on the harmonic balancer for the ignition timing. 

I'm reassembling my R2 engine after the Machine Shop work, which was completely apart when I bought it so I don't know exactly how everything was to begin with.

The harmonic balancer has two faint marks on it, one seems to be halfway across the width, the other seems to be more in the middle but not completely end to end of the width, they are 180° opposite each other.

The one with the F3 next to it seems to be less defined or not as deep impression as the one opposite it but that's the one (f3) that seems to line up with the degree indicator provided I put everything together right as far as the cam/crank gears Etc., neither mark is really etched into the balancer as I would have expected it to be in order to see when timing the ignition.

Hoping someone out there could give me a definite answer based on their experience I have included pictures of the balancer and the marks on it,,,