Assembled; Ford 390-428 Cubic Inch Cobra Jet Engine; Aluminum; 170 CC Intake Port/ 125 CC Exhaust Port; 72 CC Chamber Volume; 2.09 Inch Intake Valve/ 1.66 Inch Exhaust Valve; 1.55 Inch Spring Diameter; Single; With Guides/ Seats/ Springs For Hydraulic Roller Cam