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02-10-2004, 09:51 AM
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fuel mileage in my '81 Cj5 - 18-20 mpg, is this good?
I currently have a '81 CJ5 with a 258 I6 but would like to get a little more power. Was thinking of upgrading to a 304, are the benefits worth the expense? Are there any tricks I can do to my 258 to give me a little more power?
I know I need to replace the aging and decrepit Carter BBD, but besides that, what can I do? Also, my CTO only has 3 stems, does anyone know what hooks where? they are currently all plugged. Thanks, Joel
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1981 CJ5, 258 Inline 6, Blazer blower upgrade, all the rest is stock to include the Carter BBD. Changes coming soon....... 
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02-10-2004, 10:46 AM
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Bore and stroke the 258. Put on a 4.0L head and a fuel injection kit from www.customefis.com
You'll have a little hot rod on your hands then.
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Safety yellow and Handicap blue CJ with 5.3 Vortec/TH400/Tons/Atlas/Roks/Locks and Airshocks. 1622 Miles from Moab.
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02-10-2004, 11:22 AM
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With the mileage you get do not change any thing! tug
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02-10-2004, 04:49 PM
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there really is no crank to stroke the 258... but you can bore it and add a 4.0 head... the only way to get increased stroke is to get the crank machined and use custom rods
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93 YJ 4.0 Spring Over, 33x12.50 Mastercraft Courser M/T, High Flow Exhaust, Diamondplate Rear Bumper, Trimmed Flares, 6\" spotters  We, the Sovereign People of the Universe, wish to live in peace. We live among you, but we are not of you.
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