Give any 3-Valve 4.6L or 5.4L a "lopey" idle reminiscent of 1960's muscle cars! Engineered for naturally aspirated and supercharged applications Excellent upgrade for the 2005-2010 Mustang GT 4.6L 3-Valve engine Increases lift from the stock 11 mm/0.433" to 12 mm/0.472" Intake / exhaust duration of 221 / 240 degrees (@ 0.050" lift), lobe separation of 110 degrees. Compatible with production valve springs, followers and lash adjusters up to 6800 rpm Must be used with long tube headers to achieve a significant power gain. 4.6L High Flow Intake M-9424-463V and Throttle Body M-9926-3V recommended. Works well with Ford Racing''s M-6049-N3VPA High Performance CNC Ported 3-Valve Cylinder Heads, M-9926-3V 62mm Throttle Body and 4.6L High Flow Intake M-9424-463V Approximately 50 hp gain with the stock intake manifold and M-6049-N3VPA / M-6050-N3VPA CNC heads at 6500 rpm. Custom Calibration required! Calibration not included! Recommended WOT cam timing values included in instructions.