New 1.94" Intake & 1.5" Exhaust Valve Set 1962-1993 Chevy sb 400 350 327 307 (stock) Intake Head Diameter: 1.940" Valve Length: 4.880" Exhaust Head Diameter: 1.500" Valve Length: 4.923" Stem Diameter: 0.3414" (11/32") Stem Type: 2 Groove - Chrome Plated Hardened valve locks