Right, it was stamped LSX. But, since it's only a block, not an engine, and based off of the LS series of engines, it's going to have a generic name - Hence the LSX stamp. It's not an LS3, it's not an LSA, or whichever LS engine you can think of, it's just the block. So "LSX"= LS-nothing, or if I was to be clever and build an engine of my own off of that thing, it would be an LS-Joe
I am 99% percent positive that's the case.
