4 barrel carb for 258 - JeepForum.com
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post #1 of 6 Old 09-29-2006, 11:19 AM Thread Starter
AMC Power
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4 barrel carb for 258

What carb would be a good choice for my 258 with the 4 barrel intake? I was thinking of the Holley 470 cfm truck avenger series carb, but is that too big? I have seen a few guys that have it on their Jeeps with the 258.

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post #2 of 6 Old 09-29-2006, 01:42 PM
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You definately dont want to go w/ anything bigger than 470. Anythings better than the carter carb.

83 cj7 4" lift 33 super swampers, Fuel Injected 258
If it aint broke, fix it untill it is.
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post #3 of 6 Old 09-29-2006, 01:51 PM
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I use to run a holley 390 years ago on my offenhauser intake, worked pretty good, but I switched it over to a 2 barrell setup and went to a weber which works great for what I do with it.

85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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post #4 of 6 Old 09-29-2006, 02:21 PM
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I ran a 4 barrel setup several years back--Offy Dual Port Manifold, Holley 390 CFM 4 barrel and Advance headers. The Holley was a poor choice as an offroad carb (even the stock BBD is better)and the headers and manifold kept loosening up. Back to the stock manifold and carb. Better gas mileage and offroad ability.
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post #5 of 6 Old 09-29-2006, 05:48 PM
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Too bad you cannot do a search on this, there has been alot of good info on this topic. The truck avenger carb would be a fine choice. I have run a 600 holley for my daily driver for years and love the tunability and parts that are available for the Holley carbs. The avenger are good at running at angles and come equiped with various tuning options. If you have taken some engine preporations, your engine will do fine in running a carb of that size.

Hope this helps,
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post #6 of 6 Old 09-29-2006, 06:21 PM Thread Starter
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Thanks guys!
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