This LS was built for a customer that we have built several engines for. This particular LS was assembled for boost with 9:1 compression. We started out with a Scatt crankshaft, Oliver Racing Parts connecting rods, and Diamond pistons. Then we added a Brian Tooley Racing camshaft and Dart Pro 1 cylinder heads. We Dyno tested with a Holley intake manifold and carburetor and it made 581 HP & 546 TQ on pump gas.