CLOSELY CONTROLLED MARGIN HEIGHTS EXACT STEM TO SEAT CONCENTRICITY FULLY MACHINED COMBUSTION FACES SUPERIOR STRENGTH MATERIALS
RACE SERIES - Superior Stainless for High Temperature Gasoline Engines - Exhaust Material XH-428 with Double the Ultimate Tensile Strength ( at 1500° F ) of Imported Valves - Intake Material NK-844 with 1000 Times Better Fatigue Strength than Imported Valves. - Chrome Stems and Hard Tips - Swirl Polished and Fully Machined - Race Master ( Straight Stem ) and Race Flo Shapes Available - Recommended Exhaust Valves for Alcohol Engines