Join Date: May 2000
Location: Raleigh, NC
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Re: What type of manifold upgrade for 258/1bbl
my '76 cj-7 has a 258 in it. it originally had the 1bbl manifold and carb like yours. i got a pair of intake and exhaust manifolds from an '86 258.. i got them from some guy on ebay that was dismanting his engine.
with a stock jeep 258 2bbl intake, you will be able to bolt on a carter BBD or an older 2bbl rochester. you will also get the opportunity to route your coolant through the manifold, and the '83+ years come with electric heaters in the manifold. i'm not sure if you will be able to bolt on a newer 2bbl intake while keeping your stock exhaust, someone else will have to answer that.
If you want to put a Motorcraft 2100/2150 or standard 2bbl Holley on a stock Jeep 2bbl intake, then you will need adapter TRD-2086 from Summit Racing for $12.75, or you can make your own if you've got the tools.
Offenhouser makes a 4bbl aluminum intake which you can find in Summit, quadratrac, etc. and bolt a 390cfm Holley on it.
83 CJ-7 and 76 CJ-7 with stuff