Super Alloy Engine valves represent the highest level of advancement in valve technology. These valves are designed to meet the extreme thermal demands of today's Nitro, Supercharged, Turbocharged and Marine engines. Fits: CHEVROLET BIG BLOCK (11/32) Dimensions: Head Diameter: 1.9 "Shaft Diameter: 11/32" Overall Length: 5.45 "Tip Length: 0.25" Super Alloy Engine valves represent the highest level of valve technology advancement. These valves are designed to meet extreme heat requirements in today's Nitro powered, supercharged, turbocharged and offshore engines.Fits: CHEVROLET BIG BLOCK (11/32) Dimensions: Head diameter: 1.9 "Stem diameter: 11/32" Overall length: 5.45 "Tip length: 0.25"