Join Date: Sep 1999
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Re: 4.0 vs. 4.2
4.2 blows in comparison. you get about the same torque in both but get 70 more(about that) HP in the 4.0 H.O. The only way I would get another 87-90 YJ would be if the 4.2 or 2.5 were bad or going bad so I could put a V8 in it. However, if you live in a state where emissions aren't strict there are plenty of things to be done to the 4.2 to match the 4.0. but for me, in Califorina, its not worth the money trying to get much more legal Hp out of the the 4.2.
'89 YJ 4.2L 5speed, flowmaster, Euro taillights....