Yea, but it's a completely different engine. The Gen ll 5.7 has all different parts internally, and externally. Our engines are the Gen lll, which is the 4.8, 5.3, 5.7 (aluminum LS1) and 6.0 If you bore out the 5.3 iron block to an iron 5.7, you can swap all the stuff from the ls1 5.7 into them. I believe they have factory forged rods and the good stuff? It's fun to do a search on the Gen lll v-8's and see how tough they really are...6 bolt mains!!!