The graph above shows the first dyno test results of the E-torque Cylinder of the E-torque Cylinder head run on a newly blueprinted Jaguar 4.2L engine. The E-Torque 4.2 L Replacement Cylinder Head made 335 peak torque while the Jaguar head made only 292. The biggest difference is the shape of the two curves. Notice how much wider the torque band is on the E-torque head.

The graph above shows a comparison between the E-Torque Cyl Head and the Jaguar head related to horsepower. The E-Torque 4.2 L Replacement Cylinder Head make 330 peak horsepower while the Jaguar head made only 237. This design of the E-Torque Cylinder Head is now the 3.8 L model. The 4.2 L model’s ports have been opened up.