<P> The 3 - valve SOHC 4.6 L with variable camshaft timing (VCT) first appeared in the redesigned 2005 Ford Mustang . </P> <P> 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 . Cylinder block material varies between aluminum used in the 2004 + Mustang GT and cast iron used in the 2005 + Ford Explorer and the 2006 + Ford Explorer Sport Trac (see below), though the same aluminum heads are used in all applications . </P> <P> The 3 - valve SOHC 4.6 L engine was on the Ward's 10 Best Engines list for 2005--2008 . </P> <P> Vehicles equipped with the 24 - valve SOHC VCT 4.6 L include the following: </P>

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