340 Cam Selection

Icetech said
K.. so 107 centers that cam over TDC it looks like.. but why 107? or is it different with every cam depending on how it's ground? it looks like on this one going 109 install would retard it slightly

I can’t remember why it comes out that way. And 109 would be slightly retarded.

Maybe @PRH can explain it. I know I’ve read how that happens but I don’t have the book with me to look it up lol.