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The 1986 Ford Mustang 3.8 liter engine was rated at 120-horsepower
The 1999 Ford Mustang 3.8 liter engine was rated at 190-horsepower
The stock engine, a 5.0 or in reality a 4.9 liter had approx 225 horsepower.
The 5.0 liter V8 engine in a 1986 Ford Mustang GT was rated at : ( 200 horsepower from the factory )
The 1994 Ford Mustang GT 5.0 liter engine was rated at 215-horsepower
3.8 liter V6 ( 190 horsepower ) 4.6 liter V8 in GT ( 260 horsepower ) In a 2001 Ford Mustang
According to the 1998 Ford Mustang Owner Guide : The 4.6 liter V8 engine is rated at ( 260 horsepower at 5250 RPM )
In a 1991 Ford Mustang : The 5.0 liter V8 is rated at ( 225 horsepower from the factory )
The 2003 Ford Mustang was rated at 190-horsepower
The 1999 Ford mustang was rated at 190 horsepower for the 3.8 liter engine and 260 horsepower for the 4.6 liter engine
The 2005 Ford Mustang with a 4.0 V6 came stock with 210 horsepower.