What real difference does the lsa on a cam make?

I though LSA was built into the blank, ie you can't regrind to a new LSA? Or am I thinking cam centerline?

A good grinder like Oregon cam can put that lobe anywhere on the core they want. I sent them my slant cam that was on a 111 LSA from the factory. Now it's on a 105. I sent them my 331 Hemi cam that was 112 LSA, now it's a 106. It all demends on where the lobes are now and how much meat there is on the base circle. My Hemi cam after grinding has the base circle even with the cam core. It looks funny like some of them early cheater cams, but it's gonna work good. Course I will need different pushrods....and I am gonna run adjustable pushrods anyway so it's no big deal. They told me both my cases were not the norm though. They said that usually the LSA cannot be moved much. Both of my regrinds were exceptions. They are very good at what they do though and I think they were a little modest.