Intake Head Diameter: 2.020" Stem Diameter: 11/32" Overall Length: 5.550" Exhaust Head Diameter: 1.600" Stem Diameter: 11/32" Overall Length: 5.550". 16 valves 8 inlet 8 ex. SBC Small Block Chevy 350 Cylinder Heads Build Kit Valves Springs Keepers 7/16.