Assembled; Chevy Small Block Engine; Satin Aluminum; Angled Plug; 225 CC Intake Port/ 88 CC Exhaust Port; 68 CC Chamber Volume; 2.10 Inch Intake Valve/ 1.60 Inch Exhaust Valve; 1.55 Inch Spring Diameter; Single; With Guides/ Seats/ Springs For Mechanical Roller Cam