The LS7 427's heart and soul is the new 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 HO's foundation is a honed and decked LS7 aluminum with a 4.000” forged Callies Compstar crank and Compstar rods. It includes Mahle forged pistons and is topped off with Mast Black Label LS7 285 heads and a Chevy Performance LS7 carbureted intake manifold. ARP fasteners are used throughout and Mast pushrods ride on LS7 hydraulic roller lifters. The LS7 427 is our entry level carbureted LS7 and 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 LS7 427 HO makes 650 horsepower and is competitively priced for such a powerful complete fuel injected turnkey crate engine.
Type: LS7 7.0L
Displacement: 427 Cubic Inches
Compression Ratio: 11:1
Bore x Stroke: 4.130 x 4.000
Rev Limit: 7000 RPM
Crank: Callies Compstar
Rods: Callies H-Beam
Pistons: Mahle Forged
Cam: Mast Custom 3-Bolt Billet Core Cam
Heads: Mast Black Label LS7 285
Intake: GMPP LS7 Carbureted
Valve Springs: Mast Motorsports Dual
*All hp numbers will be within 2% of the advertised number.