that is right. i have had to learn way more about timming sets than i wanted to. it has a -4 and a +4 keyway too but the marks for them. they are almost ivisable too or i would have figured it out . maybe. if you look hard at that pic. you can see a pine needle on the ground it's a good closeup. it's a crazy except for the few with blowers or specal setups. probably 98 % of the people just put them in straght up or dot to dot. Comp Cams web site says they gring them 5 degrees advanced anyway so why advance it more. i know there is a group of builders out there that has a reason. just not us reg. guys. so my finished car sets there waiting for a new heart.