Assembled; Ford 289/302/351 Windsor Non-Emissions Engine; 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 Guides/ Seats/ Springs For Hydraulic Roller Cam