GM LS Piston Set 4.070 Bore -22.7cc

The GM LS Piston Set 4.070 Bore -22.7cc is engineered for high-performance engine builds targeting the popular LS platform. This forged piston set is designed for enthusiasts and professional builders who demand reliable power delivery in street, strip, and racing applications. The 4.070-inch bore sizing accommodates standard LS block specifications, making this a direct bolt-in solution for engine assembly and rebuild projects where precision and durability are non-negotiable.

Featuring a -22.7cc chamber volume, this piston set delivers optimized compression characteristics suitable for forced-induction and naturally aspirated LS builds. The negative chamber design reduces combustion space, enabling higher dynamic compression ratios while maintaining detonation resistance across varying fuel grades and boost levels. Forged construction provides the strength required for high-RPM operation and elevated cylinder pressures, while the precise bore-to-piston clearance ensures minimal blowby and extended ring life. The complete set arrives ready for installation, eliminating guesswork during engine assembly.

This piston set is ideal for LS1, LS2, LS3, and compatible LS-variant engine blocks requiring stock or modified bore diameters. Installation requires proper ring end-gap checking, piston pin clearance verification, and careful bore honing to specification—tasks best performed by experienced builders or professional machine shops. The MPN 1001713 designation ensures correct fitment and cross-reference compatibility across supplier networks. Whether building a carbureted classic car engine or a fuel-injected performance platform, the GM LS Piston Set 4.070 Bore -22.7cc provides the foundation for consistent, reliable horsepower.