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With some modification it could be done

The blocks are nearly the same. If you use the 258 intake and distributor in the 4.0; the only part that will need modifying is the exhaust from the manifold. I did one in a weekend using a 727 from a 91 wagoneer and a 02 4.0 engine. I used the 258 intake, carb, and distributor. I used the old v belt system to make it easy. It's easier to mod up an engine that's already running than making it work later.

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Q: Is is possible to swap a 242 L6 4.0L Jeep engine into a 1987 AMC Eagle with a 258 L6 4.2L engine?
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