Hey I found the magazine! "Engine Masters" fall of 2006. " Most aftermarket cams are ground with some advance built in, typically about 4 degrees. Advancing the cam makes all the valve train events happen earlier, and genrerally favors low rpm operation, helping idle quality, cylinder pressure, vacuum, and lower speed torque. Retarding the cam deteriorates these characteristics, though in some cases high rpm power may be enhanced. The real score here is that ... most of the time retarding the cam will gain little if anything, even up top"

Question: What size degree wheel would do the job?