LSX 15-Deg FT Piston & Ring Set 4.125 Bore

The LSX 15-Deg FT Piston & Ring Set 4.125 Bore from Diamond Racing Products is engineered for serious LS platform builders who demand precision-forged internals for high-performance and competition engines. This piston set is purpose-built for applications requiring durable, reliable ring sealing and controlled combustion geometry in stroker and modified LS builds. Whether you're assembling a track car, bracket racer, or street performance engine, this forged piston and ring combination delivers the structural integrity and repeatability that separates professional builds from off-the-shelf solutions.

Diamond Racing's 15-degree flat-top design minimizes compression chamber volume while optimizing quench clearance for controlled detonation and efficient combustion. The 4.125-inch bore specification accommodates both stock and modified LS blocks, and the complete ring set ensures proper blow-by control and oil management across a wide RPM range. Forged construction provides superior strength and thermal stability compared to cast alternatives, allowing these pistons to handle the elevated pressures of forced induction, nitrous systems, and high-boost applications without compromise. The precision-machined skirt design reduces friction and noise while maintaining critical clearances that maximize ring life and engine longevity.

This piston and ring set is ideal for LS1, LS2, LS3, and LS-based crate engine builds where factory internals cannot withstand intended power levels. Installation requires proper honing to the specified bore diameter, careful ring gap verification, and correct piston-to-wall clearance setup—tasks best performed by experienced engine builders familiar with LS platform tolerances. Compatibility extends across naturally aspirated, supercharged, turbocharged, and nitrous applications, making this a versatile choice for both street and dedicated race engines where reliability cannot be compromised.