Edelbrock 61609 SBF 351C Performer RPM Cylinder Head - Bare Edelbrock 61609 Performer Series RPM Cylinder Head; Bare; 350-500 hp Max; Std. Exh. Port; 60cc Chamber Vol.; 2.05Intake/1.60 in. Exh. Valves; 0.580 in. Max Lift; Single; Cast Aluminum Edelbrock 61609 Warranty: Yes