Feature●1. 81 in. Valve Head Diameter●5. 375 in. Overall Length●45 Degree Seat Angle●0. 341 in. Stem Diameter●For Use With Part #77919, #77929, #77939, #77949Description 1-piece, swirl-polished, hardened tip stainless steel exhaust valves with undercut stems for increased flow. Hard-chromed valve stems are 11/32in. except where noted