| length of the lobe from its highest point to the backside of the base-circle and subtracting the diameter of the base circle from that value. Lets just say for conversation: a stock cam has a base circle of 1.235" and lobe height of 1.585". 1.585"-1.235" = 0.350" total lift. Now take that cam and reduce the diameter of the base circle by 0.030" to put it at 1.205". Since you took .030" off the diameter, that means you took .015" off of the lobe height (because you are measuring from the base circle to the top of the lobe). 1.585 - 0.015 = 1.570 and then subtract 1.205 from that to get 0.365" lift. No welding is required to increase lift, and you can also manipulate duration freely as well, but there are obvious limits to the amount of grinding that can be done to increase lift. The issue here is that when you grind the base circle, there will be less preload on the lifter - in testing, it was noted that there was actually a few thousandths of a gap between the lifter and the cam lobe. If it is left this way, it will make noise very similar to lifter tick. To correct for this, during the valve job the installed valve height should be increased so as to allow the lifter to fully seat and have some level of preload onto the cam. I've been looking for some valve lash caps that will work with the VG as then it will not require a complete head job with increased installed height of the valves to keep everything in check. We know how to build the heads properly for these cams but not everyone can figure it out - this is why we dont sell our cams by themselves.
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