LS PowerPak Piston Set 4.005 Bore -5..8cc

The LS PowerPak Piston Set 4.005 Bore -5.8cc from MAHLE PISTONS is engineered for serious LS engine builders and high-performance enthusiasts seeking reliable, precision-crafted internal components. This piston set serves as the foundation for any LS platform build—whether you're constructing a naturally aspirated stroker, forced induction package, or street performance application. Built by MAHLE, an OEM-trusted manufacturer with decades of motorsports heritage, these pistons deliver the durability and consistency required for demanding engine builds.

The 4.005-inch bore specification fits LS blocks requiring slightly oversized piston diameters, accommodating .005-inch overbore cylinders for maximum displacement and ring sealing integrity. The -5.8cc dish design lowers compression ratio, a critical feature when pairing these pistons with forced induction systems or pump gasoline in high-boost applications. MAHLE's precision casting and skirt design minimize piston rock and reduce friction, extending ring life and improving fuel economy without sacrificing structural integrity. The complete set weighs 11.75 lbs, indicating full forged or premium cast-aluminum construction designed to handle sustained high RPM and cylinder pressure.

This piston set is ideal for LS engine platform builds requiring overbore clearance—including LS1, LS2, LS3, and LSA applications with custom boring procedures. Installation demands precise honing to specification and proper ring gap measurement; work with an experienced machine shop familiar with LS platform tolerances. Pair these pistons with quality connecting rods, ring sets, and a freshly honed block for optimal ring sealing and longevity. Whether building a weekend warrior or purpose-built race engine, the LS PowerPak Piston Set delivers the precision foundation serious builders expect.