Got an engine awhile ago that had this solid lifter cam in it. Guy I bought it from didn't know what size cam it was being that he didn't build it. After measuring the base circle and top of lobe, and subtracting base from lift, I come up with.383. Multiply by 1.5 rockers I have and it's 574?? Anyone hear of a 3bolt SL purple shaft cam? I'm trying to figure if I'm going to use it or have it reground. Thanks in advance