The Iron 408's heart and soul is the new 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 foundation is a honed and decked LY6 iron block with a 4.000” forged Callies rotating assembly. It includes Mahle or Diamond forged pistons and is topped off with CNC LS3/L92 GM heads. ARP fasteners are used throughout and Mast pushrods ride on 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 starts at the 500 horsepower mark and is competitively priced for such a powerful complete long block.
Type: LY6 6.7L
Displacement: 408 Cubic Inches
Compression Ratio: 11:1
Bore x Stroke: 4.005 x 4.000
Rev Limit: 7000 RPM
Crank: Callies Forged
Rods: Callies H-Beam
Pistons: Mahle Motorsports
Cam: Mast Custom 3-Bolt Billet Core Cam
Valve Springs: Mast Motorsports Beehive
*All hp numbers will be within 2% of the advertised number.