The WK Grand Cherokee brought about a complete makeover in the drivetrain department from the previous generation. The trusty 4.0L straight-six was finally put out to pasture in favor of a new 3.7L V6. But the headliner was the availability of Dodge's newest Hemi V8. Displacing 5.7L in standard form and 6.1L in SRT-8 Grand Cherokees, power numbers crept up to new levels for Jeep's premium offering.

From Ford Flathead to GM Gen V LT, and including everything in between like small-block and big-block Ford and Chevy, Gen III/IV LS, Coyote, Hemi, and more, we have the parts to coax more power out of the engine under the hood of your hot rod.