Assembled; Ford Windsor 4.7L-5.8L/289-351 Cubic Inch; Natural Aluminum; 205 CC Intake Port; 62 CC Exhaust Port; 60 CC Chamber Volume; 2.08 Inch Intake Valve; 1.60 Inch Exhaust Valve; 1.55 Inch Spring Diameter; Set of 2; With Pushrod Guides; Rocker Studs