Need more power from the 'ol 258 -
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Unread 10-21-2007, 12:17 PM   #1
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Join Date: May 2004
Posts: 20
Need more power from the 'ol 258

I can't find much info on getting more power out of it, except a few articles here and there.
Is the 4.0 head swap really worth 40hp? Because thats quite a bit for a simple head swap. Are there any other power adders for relativley cheap(i'm not going out buying a blower or turbo)? Like maybe headers, carb, etc? I've been trying to search but I haven't yielded much.
The motor is in a '85 CJ7 if it matters any.

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Unread 10-21-2007, 10:09 PM   #2
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1971 CJ5 
Join Date: Jan 2002
Location: Eagle Point Oregon
Posts: 6,199
HEI ignition and a Motorcraft carb swap if you don't need to wory about an emissions inspection. Do a search. Tons of info on these swaps in the CJ forum. Might also give us a tire size. Many "weak engines" are really gearing problems due to over sized tires.
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