The LS7 features a unique, big-bore 4.125" aluminum cylinder block that is anchored with a 4.000" forged steel crankshaft, feather-weight titanium connecting rods and high compression friction-coated pistons. But it’s the airflow capability of the large, GM CNC-ported heads that enables its tremendous power. Large volume, straight-passage intake runners channel air directly through 2.20" titanium intake valves located on a 12-degree valve angle. Chevrolet Performance’s LS7 427ci crate engine package includes the Z28 production-style engine with the dry sump oil pan. You’ll need to supply the external oil supply and oil lines to the engine, but the rest of the assembly is fully dressed, including the manifold assembly with injectors and electronically controlled throttle body, and log-style exhaust manifolds.