The LS7 427's heart and soul is the new 4.125 aluminum block. The LS7 designation has a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports LS7 billet cam core. The 427 foundation is a honed and decked LS7 aluminum block with a 4.000” forged Callies rotating assembly with Mahle or Diamond forged pistons that is topped off with Mast Black Label heads and a LS7 or MSD Atomic Airforce intake manifold. ARP fasteners are used throughout and Mast pushrods ride on LS7 hydraulic roller lifters. The LS7 427 is just one of a diverse line of Mast Motorsports hand built Turnkey Crate Engines that are designed for the Hot Rod/Muscle Car market. The engine starts at the 630 horsepower mark and is competitively priced for such a powerful complete fuel injected turnkey crate engine.