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post #1 of 4 Old 05-15-2001, 04:48 PM Thread Starter
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Engine Horsepower

Is it true the 4.2 liter (258) only has 115 horsepower? And the 4.0 liter has 160 hp or so? I saw this on some other post somewhere and thought this is sure underpowered. If so, will the 4.0 fit up the same as a 4.2?

thanks for any input..

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post #2 of 4 Old 05-18-2001, 07:51 PM
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The 4.2l has carbs and it's got a shade over 110 hp. The reason is that it's not made for high speed. It's a torquer made for low RPM balls. It's got almost as much torque as the 4.0l HO.
I have heard that a lot of people put the 4.0l heads/fuel injection on their 4.2l. Not sure what that does to the power.
I haven't driven a 4.2l, so I don't know how it compares to the 4.0
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post #3 of 4 Old 05-20-2001, 03:56 PM
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check out these 2 web sites, one compares the engines and the other gives you all the info you need to do a 4.0 head conversion on your 4.2,,, www.jeeptech.com & http://monsterslayer.com/jeep/40Head/40Head.htm

hope this helps.

89 sahara, 4.2 , k551 weber, nutter bypass, tuffy stereo security console & under seat security drawer, 4'pro comp & 3'body, front waggy44 w/detroit & 4.88, rear waggy44 w/detroit & 4.88, teralow sye, tw's cv drive shaft {rear}, warn locking hubs, boomerrangs all around, 35x15.50 tsl-sx swampers { love that roar}.
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post #4 of 4 Old 05-21-2001, 01:25 PM
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the beauty of the 4.2 is tourqe down low 1800 RPM.ITS REALLY A GREAT OFF ROAD MOTOR.
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