Detail Ferrea competition plus nickel stainless alloyHead 30.5mm x length 103.65mm x stem 6mm x tip 3.5mmclearance item comp plus exhaust valve nssan 30.5 6 103.65 This engine part suits the Nissan 300ZX Z32 with a VG30DETT Turbo (DOHC 24 Valve) engine.