Techtonics Hydraulic 16V 288 Fair mid-range and excellent top end power. Works best with carburetors or Individual Throttle Body Injection (ITB). These are race camshafts. Chilled hardened billets with timing gears installed. #109.083 HD Valve Springs Required. (244 duration @.050″, .456″ lift, 108 lobe center), Valve/Piston clearance must be check!