The Jeep 4.0 inline six was one of those accidental successes, expecially when they dumped the crappy carbs they kept getting and started putting fuel injection on them. They were burned clean, more power than some v-8's, and resonably efficient for their time. Its too bad they canceled/replaced it instead of updating the engine. The 3.8 that took its place wasn't near as good by any measurement.
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