Ones I've dealt with had 3 keys and 3 unique marks. Whatever symbol is over the crank key you use, match the other like symbol to the dot on the cam cog.
You'd be surprised at the number of cylinder heads I got to redo when multi-key way crank gears showed up. Hey I'm gonna put it on the triangle, then they lined up the 0 dot... smack smack smack smack... Valve sales were very good!
