LS Swapping A Jeep CJ7 Gives You Big Power And Fuel Economy ... If your CJ-7 came with the 4.2-liter six that preceded it, you can make that swap pretty easily. For even bigger improvements ...

The Jeep brand dates back to World War II when ... in their CJ with one of AMC's strong but gas-chugging V8s or swap in a Chevy LS motor, but supply and demand make these engines and underbody ...