GM Performance 19434648 LS3 6.2L Gen IV Crate Engine - 525 HPLS3 Crate Engine 525 HP Crate Engine 376 Cubic Inch 525 HP GM LS Series LS376 525 Long Block LS long blocks from Chevrolet Performance offer the core capabilities of complete crate engines at a low cost, allowing builders to finish the assembly their way. The LS376 525 long block is delivered without the intake manifold, coil packs, water pump, exhaust manifolds or other accessories. NOTE: LS376 525 Long Block is used to build LS376 515 crate engine