Kent State University Football Stadium Manley Chrysler 426 Hemi 1.900 Head .3100 Stem Standard Length Race Master Exhaust Valves (Set of 8). Manley? s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM Recommended for Alcohol Engines: These valves are the recommended choice for exhaust valves in alcohol engines, ensuring reliable performance even in demanding conditions. Swirl Polished and Fully Machined: The valves feature swirl polished under head areas and fully machined combustion faces to optimize airflow and combustion efficiency. Stainless Steel Construction: Both exhaust (XH 426) and intake (NK 842) valves are constructed from high quality stainless steel for unparalleled durability. Variety of Shapes: Choose between Race Master (Straight Stem) and Race Flo shapes to suit your racing engine's specific requirements. Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity and wear resistance.