text: Jerry Odom's "A history of the Ford Mustang Mach 1"\nhttp://www.jerryodom.com/mach1history.html\n\n"Standard engine was the new 351 c.i. V-8. This engine was basically an enlarged 302 and is known as the 351 Windsor, as it was made in Ford's Windsor plant. With the two-barrel carburetor and single exhaust, the base Mach 1 engine was rated at 250hp. The optional 290hp. 351 c.i. V-8 four barrel engine came with dual exhausts and chrome quad outlets. The old 390 c.i. V-8 was also optional, rated at 320hp, with the top engine option being the torquey 428CJ, rated at 335hp."