Assembled; Ford Windsor 4.7L-5.8L/289-351 Cubic Inch; Natural Aluminum; 170 CC Intake Port; 60 CC Exhaust Port; 60 CC Chamber Volume; 2.02 Inch Intake Valve; 1.60 Inch Exhaust Valve; 1.46 Inch Spring Diameter; Single; With Pushrod Guides; Rocker Studs