carburating a 4.0 stroker. -
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Unread 07-28-2013, 10:20 PM   #1
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Join Date: Jul 2013
Location: edinburg, TX
Posts: 5
carburating a 4.0 stroker.

Yea I'm a newbe to the Jeep world, but I'm a old fart when it comes to AMC and Rambler. So here is my question. Building a short rod 4.6 and need to keep it basic. Yes I could go fuel injection but I want to keep it carburated, 1980 CJ originally a 4.2 with a heavy cast iron intake and a 24 inch crack down the side of the block. I have the machining equipement.(Bridgeport) can I just machine the 4.0 intake to accept the 2100 series carb. The runners on the non HO intake are very similar to the 4.2 intake. The HO looks like it would flow better but I'm wondering about atomization of the fuel in the 4.0's intake. has anybody done this before. again I No just about all there is about fuel injection and it cant be beet but I want to go carburated. Even if I can't spell the word.

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Unread 07-29-2013, 12:28 AM   #2
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Location: Centralia, WA
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I'm stuck in the same situation for almost completely different reasons. I'm familiar with the Hornet and Rambler and my project is Eagle. I've been using carburetors my whole life and on the I6 series I prefer Carter against the advice of everyone. I am NOT familiar with fuel injection and upon doing so I want to keep my hydraulic transmission and stock electrical harness, which is why I'm stuck using Renix as a crutch. The bad news is that the 4.2L was an intake orphan but that doesn't mean it's not an option for the 4.0L head. The major change with the new head design is that the old 4.2L exhaust is no longer compatible. That seems to be the only important change.

It is far easier work to modify the 4.2L intake to sit proper against the intake ports instead of remachining an injection manifold to have a carburetor mount. Because I'm starting to get lazier than that I'm at the point where I would just suggest a Clifford or Offenhauser intake. It should line up perfectly but there is still work when setting up the intake alignment holes to sit just above the pins. This thread shows the main issues with setting up carbureted intakes on the 4.0 head. Plenty of forums expand on this pretty good but at least this one is clear about it with good pictures.
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