The E7 was a 12-liter (728-cubic-inch) four-stroke engine using direct injection technology. The E7’s total power rating was between 250 and 454 horsepower between 1,700 and 1,800 rpm. In his 250 pony outfit, the torque was 975 foot-pounds at 1,200 rpm. At its 300-horsepower specification, torque is 1,160 pound-feet at 1,200 rpm. The pair jumped to 1,360 pound-feet in the E7 with 350 horsepower. In its 400 horsepower design, torque peaked at 1,460 foot-pounds at 1,250 rpm. The higher-powered E7 engine produced 454 horsepower and produced 1,660 pound-feet of torque at 1,200 rpm.