If you've ever been disappointed by the horsepower figures coming from your Jeep Wrangler JK, whether it has the 3.8-liter or the 3.6-liter V-6, and you've considered an LS swap, you're not alone.

There’s a lot to like about the members of the Jeep SJ family of trucks, but they came from the factory powered by engines with ancestries stretching back to the 1950s and 1960s. Modernizing an SJ ...