Hi Eric, the engines I'm using are the based on the first generation LT small block 350 cid. The first one come out in the 1970 Z28 Camaro, most refer to it as a generation I sbc. With just a few changes, one piece rear main seals, roller cam lifters, higher flowing heads, over the years, the generation I was in production until 1999, and I "think" .. the last one's, including the LT I with reverse coolant flow, was used until 2002, in high performance cars, heavy duty trucks, and marine applications. I don't know a Thing about the LS engines, but I will probably be trying to learn something about them after I get my new motor built ... a man is never satisfied ya know.