Our LS 427CI 625HP crate engine package is designed with an LS3 small bore block with a longer stroke. This build features higher quality parts from the ground up at a more reasonable cost. Some of this engines main features include a seasoned aluminum GM 6 bolt main block, completely forged bottom end, custom ground hydraulic roller camshaft, performance LS3/L92 cylinder heads, r performance rocker arms and a muscle car oil pan designed to fit almost every application. We can also assist you in picking out the correct motor mount and header combination that will fit your hot rod, as well as a complete serpentine pulley kit and transmission.