The LS7 427's heart and soul is the new GM LS7 4.125 aluminum block. The 427 designation has a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports billet cam core. The 427 Black Label's foundation is a honed and decked LS7 aluminum block with a 4.000” forged Callies Compstar crank and Compstar rods. It includes Diamond forged pistons and is topped off with Mast Black Label LS7 285 heads and a Mast LS7 4500 Carbureted single plane intake manifold. ARP fasteners are used throughout and Mast pushrods ride on GMPP high rpm hydraulic roller lifters. The LS7 427 is at the top of a diverse line of Mast Motorsports hand built Turnkey Crate Engines that are designed for the Hot Rod/Muscle Car and Offroad markets. The LS7 427 Black Label makes 725 street drivable horsepower and is competitively priced for such a powerful complete fuel injected turnkey crate engine.
Type: LS7 427
Displacement: 427 Cubic Inches
Compression Ratio: 11:1
Bore x Stroke: 4.130 x 4.000
Rev Limit: 7500 RPM
Crank: Callies Compstar
Rods: Callies H-Beam
Pistons: Diamond Racing
Cam: Mast Custom 3-Bolt Billet Core Cam
Heads: Mast Black Label LS7 305
Intake: GM LS7
Valve Springs: Mast Motorsports Dual
*All hp numbers will be within 2% of the advertised number.