Cast Aluminum Cylinder HeadBig Block Chevy 396 w/Hydraulic Flat Tappet CamAssembled Head119cc Combustion Chamber305cc Intake RunnerIncludes Valves & SpringsPort Dimensions: Int 2.5x1.77, Ex 2.05x1.82Set of 2 Special Note: Camshaft and Lifters Not IncludedIntake Runner: 305ccCombustion Chamber Volume: 119ccIntake Valve: 2.250"Exhaust Valve: 1.880"Max Lift: .550"Coil Bind: .740"Intake Install: 130 lbs @ 1.8Exhaust Install: 130 lbs @ 1.8Closed Seat Pressure: 110 lbsOpen Seat Pressure: 300 lbs Installation Requirements:746-PCE279.1008 Head Bolt Kit746-PCE254.1038 Intake Pushrod Set746-PCE254.1044 Exhaust Pushrod SetEmissions Note:This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART