The Iron 408's heart and soul is the new GM LY6 4.005 iron block. The 408 designation has a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports billet cam core. The 408 Black Label's foundation is a honed and decked LY6 iron 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 LS3 255 heads and a Mast LS3 4150 Carb Single Plane intake manifold. ARP fasteners are used throughout and Mast pushrods ride on GM LS7 hydraulic roller lifters. The Iron 408 is just one 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 Iron 408 Black Label makes 600 horsepower and is competitively priced for such a powerful complete fuel injected turnkey crate engine.
Type: LY6 6.7L
Displacement: 408 Cubic Inches
Compression Ratio: 11:1
Bore x Stroke: 4.005 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 LS3 255
Intake: Mast LS3 4150 Single Plane
Valve Springs: Mast Motorsports Dual
*All hp numbers will be within 2% of the advertised number.