The GT40 and GT40P cylinder heads are highly sought after, but how do they stack up against other cylinder heads, and is it worth it to upgrade the Fox Body's stock heads? We compare the GT40s to modern cylinder heads as well as other heads from the era.

Find out which rear gear ratio is best for your Mustang using the Engine RPM Calculator right here in the CJ’s Resource Center. Whether you’re looking for new rear gears that will provide better gas mileage or quicker acceleration, this Engine RPM Calculator will help you maximize efficiency and acceleration to make sure you get the right rear gears the first time!

The first generation of Mustang saw significant changes in the engine lineup from one year to another. Using the engine code from your Mustang's data plate, you can find out important information about your Mustang's engine. This breakdown offers specifics on each of the many available engines from the Mustang's first generation.