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*All hp numbers will be within 2% of the advertised number.
Mast Motorsports Handbuilt LS engines feature the best components and are assembled by professional machinist. All handbuilt engines feature ARP Main Studs, ARP Head Bolts or Studs and a balanced and blueprinted block.
The LS7 427 Black Labels’ heart and soul is the new GM LS7 4.125 aluminum block. The LS7 designation has a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports LS7 cam core. The 427 foundation is a honed and decked LS7 aluminum block with a 4.000” forged Callies Compstar rotating assembly with Mahle pistons that is topped off with Mast Black Label LS3 280 heads and a Whipple 2.9L Supercharger. ARP fasteners are used throughout and Mast pushrods ride on GMPP High RPM hydraulic roller lifters. The LS7 427 Black Label is at the top of of a diverse line of Mast Motorsports handbuilt LS7 based Supercharged Crate Engines that are designed for the Hot Rod/Muscle Car market. The LS7 427 Black Label Supercharged engine peaks at the 800 horsepower mark and is competitively priced for such a powerful complete fuel injected turnkey crate engine.
