Assembled; Chevy Small Block 5.0L-6.6L/302-400 Cubic Inch; Natural Aluminum; 185 CC Intake Port; 65 CC Exhaust Port; 64 CC Chamber Volume; 2.02 Inch Intake Valve; 1.60 Inch Exhaust Valve; 1.46 Inch Spring Diameter; Single; With Pushrod Guides; Rocker Stud