What is a 3 valve Mustang?
What is a 3 valve Mustang? The 3-valve SOHC 4.6 L with variable camshaft timing (VCT) first appeared in the redesigned 2005 Ford Mustang. The engines are equipped with an electronic Charge Motion Control Valve (CMCV) system that provides increased air velocity at low engine speeds for improved emissions and low-rpm torque. Is the Ford Expedition 2 valve or 3 valve? I think it was 2 valve for both 4.6 and 5.4, then the 5.4 went up to a 3 valve in 2005, and they discontinued the 4.6. Click to expand... I think it was 2 valve for both 4.6...