Set of (8) Small Block Chevy 1.600 +.100 long Exhaust Stainless 1 pc Valves.Head Diameter: 1.6" Swirl polished head with undercut stems. Material: Forged one piece 21-4N stainless with hardened stellite tip. +.100" longer than stock.Valve Length: 5.025". Tip length: 0.250".