PRC Stage 2.5 LS6 Cylinder Heads

The Texas Speed PRC Stage 2.5 LS6 cylinder heads are professional-grade, CNC-ported upgrades built from seasoned GM 243 or 799 castings. By applying advanced CNC machining to the intake and exhaust ports, these heads significantly enhance engine volumetric efficiency compared to stock specifications. Technically, these heads come equipped with 2.02-inch intake and 1.575-inch exhaust stainless steel valves. They are available with multiple chamber configurations between 58cc and 64cc, allowing for precise compression ratio tuning. The assembly is fully machined and milled to meet specific performance requirements. For high-lift cam profiles, an optional PAC .660-inch lift dual valve spring kit is available. This upgrade includes precision-machined titanium retainers, hardened spring seats, and new Viton valve seals to ensure valvetrain stability and extended service life under aggressive operating conditions. As these are performance-oriented internal engine components, professional installation is recommended to ensure correct geometry and compatibility with the existing valvetrain and rotating assembly.