Type:    LS7 7.0L
Displacement:  427 Cubic Inches
Compression Ratio:  11.4:1
Bore x Stroke:  4.125 x 4.000
Rev Limit:   7200 RPM
Crank:   Scat Forged
Rods:   Scat Forged H-Beam
Pistons:   Mahle Motorsports
Cam:   Mast Custom 3-Bolt Core Cam
Heads:   Mast Custom CNC LS7 Heads
Intake:   GMPP LS7 Intake Manifold
Valve Springs:  Manley Polished Double Spring


Make:   Chevrolet
Engine Type:  V8
CID:   427
Liter:   7.0
Engine Size:   7.0L/427
Engine Family:  GM Small Block Gen IV (LS Based Engines)
Fuel Delivery:  Fuel Injection

The LS7 427 SS is based around GM’s new Gen IV 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 camshaft is designed with a narrower lobe separation angle to produce high RPM horsepower for the customer wanting a Street/Strip combination.  The 427 foundation is a honed and decked LS7 aluminum block with a forged Scat rotating assembly with forged Mahle pistons that is topped off with Mast CNC LS7 heads and a LS7 intake manifold.  ARP fasteners are used throughout and Manley pushrods ride on the GMPP High RPM hydraulic lifters designed for the Cadillac CTSVR.  The 427 displacement uses a combination of a 4.125” finished bore with a 4.000” stroker crankshaft.  The custom Mahle pistons are specifically designed to reduce cylinder wall wear and reduce the oil consumption that is typical for GM Gen IV stroker engines.