Spark plug timing marks

Look for faint white lines at each side of bend on plug tang about an 1/8th apart.

The one towards the electrode are initial...and the one nearest base ring are total/full advance. the closer those two are, the shorter the advance rate is...for instance, 22 initial and 32 will be closer than 12 initial and 36.. which would be wider gap with the initial mark further out on the tang near electrode.