Intake runner port volume: 205cc Combustion chamber volume: 66cc Chambers can be milled to 49cc Intake valves: 2.04" diameter Winston Cup takeout titanium Exhaust valves: 1.60" diameter Winston Cup takeout titanium Springs: .600" lift 1.440" diameter dual 150 lbs @ 1.850" Retainers/Locks: 10 degree titanium Hardened cups and Viton seals Each set is flowed and flow sheets provided. Completely assembled and ready to bolt on.