Assembled; Chevy Big Block; Natural Aluminum; 367 CC/377 CC Oval Intake Ports; Raised 0.750 Inch 128 CC Exhaust Port; 114 CC Chamber Volume; 2.30 Inch Intake Valve; 1.90 Inch Exhaust Valve; 1.635 Inch Spring Diameter; Single; With Pushrod Guides; Rocker Arm Studs