Advice please..... -
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post #1 of 6 Old 03-25-2003, 06:02 PM Thread Starter
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Advice please.....

I have a 83 CJ7. It is a 258 that has a 4BBL Holley carb on it right now. Instead of rebuilding it, I would like to buy a different 4BBL carb for it. Which one should I look at? Thanks! Sorry, new with the Jeep thing!

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post #2 of 6 Old 03-26-2003, 12:13 PM
Chad Churchill
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you have a 4barrel on a 258? wow not to great of gas is it? well here are some carbs you could put in 650 cfm, manual choke, Edelbrock Thunder Series AVS carburetor ... $329.95 or 650 cfm, electric choke, Edelbrock Thunder Series AVS carburetor ... $359.95 ... but Holley has 390 CFM Four Barrel, Model 4160 - Street
and 600 CFM, 4 Barrel, Model 4150 Street/Strip Supercharger Carb
I had a Webber 2 barrel in my 84 befor i went to Fuleinjection..
so i donno lol
Hope this can help you out, but if your looking for better gas i would go with a smaller carb on a 258 inline 6..

'84 AMC CJ7.. 4" rancho 9000 9 way+ 1'' Tow Shacks+ 1'' BD, 9,000 warn winch, 33''BFG mudd, T176,Danna 300 with Twin shifter,44 front,20rear,4.56 with locks, 258beefed, w. fuel injected!,MSD,new white paint, all new intr., and two onbord airs. Member of TMTC, member of offroadministry, and go 4x4ing all over the U.S.A.!!!
'98 TJ... 4" Teraflex with rancho 9000 9 ways. 33" all's with solid Axles and 4.56 with locks.. Hunter green and ready to go..
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post #3 of 6 Old 03-26-2003, 06:58 PM
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many people put large carbs on their 258 thinking it will get great power. Some have increases... mostly in fuel consumption and wasted fuel. Some put the 600cfm or larger because they are sometimes cheaper or they purchase them used.

From experience don't put on any carb larger than 500cfm. I have a hopped up 258 with it and it is still too large.

putting either the edelbrock thunder carb (650 cfm) or the holley carbs (600 cfm) is not a great idea, espically if you have a near stock engine - or even warmed up.

Summit racing has the 390 cfm carb (what I recommended) mentioned [ the 4160 series ] for $280.

summit part #: HLY-0-8007

This should give you better mileage... if you don't already have it on there.

check online to see what the serial numbers are on the carb to see what exactly you have.

Be sure to adjust it when you get it.

. . . end transmission . . .
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post #4 of 6 Old 03-27-2003, 06:59 PM
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I agree with the scientist. The 390 is what I had on my 85 cj7 and it ran great. With the 4 barrel all you are doing it wasting gas. I would be willing to bet the 390 will work great 4 you.

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post #5 of 6 Old 03-28-2003, 07:49 AM
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Originally posted by Sandman74
I agree with the scientist. The 390 is what I had on my 85 cj7 and it ran great. With the 4 barrel all you are doing it wasting gas. I would be willing to bet the 390 will work great 4 you.
The 390 IS a 4-BBL.
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post #6 of 6 Old 03-28-2003, 02:47 PM
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Merch Boy,
Send me some pics of your Jeep....I'd like to see it. Being an Austinite myself.

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, I6-258, T-4, 1" M.O.R.E. BL, RE 2.5", Weber Carb, 33" ProComp MT
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