Single Exhaust Valve\n\nCompatible with: GM 3.8L 231 (Enginetech V3223)\nNominal Stem Diameter: 8.00 mm\nET Stem Diameter: 0.3132 inches\nStandard Head Diameter: 1.526 inches\nET Head Diameter: 1.526 inches\nValve Length: 4.713 inches\nNumber of Grooves:...