I've seen some of David vizard's videos and have a book he wrote, he talks LCA alot not LSA and have read in the forums that a LCA and LSA are the same.
LSA =LOBE SEPARATION ANGLE. LSA is ground into the cam during manufacturing.
LCA =LOBE CENTER ANGLE. Lobe center angles can be changed by indexing the cam when degreeing it in, hence advancing or retarding the cam. Keep in mind some cams are up to 4 degrees advanced when installed "dot to dot"