Degreeing Cam by Measuring Overlap @ Lifters

Well, and with a used cam, "if you don't know" what the cam "is" you may not be able to intelligently degree it. If it was in there with a "dot to dot" cam drive, that might be all you can do. "Generally" since most of us run "torque" engines without extensive headwork, etc, the generaly trend is to advance a cam, which moves the power curve down in RPM. On the other hand if you are building a high RPM rip-snorter with high compression, porting, etc, you might want to "lean" the other way.