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Unread 11-05-2009, 10:01 AM   #1
78CJFIVE
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1978 CJ5 
 
Join Date: May 2008
Location: Radcliff, Kentucky
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A question about 258 Intakes and Carb Upgrades

If your Jeep has the Carter 1BBL does that mean that your Intake can only accept 1BBL Carbs?

Is it possible that the Jeep has a 2BBL Intake with a Carter 1BBL? If yes, how common is this, and what is the easiest way to know?

I would like to upgrade my Carter 1BBL to ether the MC2100 or a Weber. If I have a 1BBL Intake, I know that I can ether get a new Intake, or an adapter plate.

I know the plate would be cheaper route. What are the advantages (besides cost obviously) / disadvantages to the adapter plate?

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Unread 11-05-2009, 10:59 AM   #2
Pathkiller
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1974 CJ5 
 
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If your Jeep has the Carter 1BBL does that mean that your Intake can only accept 1BBL Carbs?

Yes. Unless you get an adapter to put a 2bbl carb on your 1bbl intake.

Is it possible that the Jeep has a 2BBL Intake with a Carter 1BBL? If yes, how common is this, and what is the easiest way to know?

Possible, but highly unlikely. It wouldn't be a factory setup, but some previous owner might have done this for god know's what reason.

I would like to upgrade my Carter 1BBL to ether the MC2100 or a Weber. If I have a 1BBL Intake, I know that I can ether get a new Intake, or an adapter plate. Yes.

I know the plate would be cheaper route. What are the advantages (besides cost obviously) / disadvantages to the adapter plate?
Advantages: Cost. Can't think of any others.
Disadvantages: Not getting full performance potential from your new 2bbl carb by restricting it via a 1bbl manifold. Essentially this is like a NASCAR restricter plate. The new 2bbl will still give you better performance than your old YF, but not as much as you could potentially get by using a proper 2bbl manifold. Or even an aftermarket 4bbl manifold with a 2bbl adapter.
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Unread 11-05-2009, 11:45 AM   #3
John Strenk
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Might even need two adapters. "Large 2bbl to small 2bbl" and then a "small 2 bbl to 1 bbl adapter". lots of places for leaks.

You could always get a 1bbl off a Ford F-150 with a 300 cuin engine, That's a big YF 1bbl.

Best though with a 2 bbl manigold.

There are two 2bbl manifolds also. On water heasted and one were the exhaust bolts to the intake. The water cooled one would be better.
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Unread 11-05-2009, 06:58 PM   #4
MikeMCJ
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1951 M-38 
 
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I think you need a cast iron 2bbl, not the aluminum ones used on later 4.2s, to work (properly) with your exhaust manifold. I've been looking for one as well. I think casting #8126521 will work, but I know there are others. Maybe someone with a cast iron 2bbl can post their intake casting #?
intake.jpg  
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Unread 11-05-2009, 07:39 PM   #5
bas157
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1980 CJ7 
 
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MikeMCJ, I've got a cast iron 2 brl one laying around (well its my brothers but its laying around my house) that has a few numbers on it. How do you know which is the casting number? Does 3227135 sound like a casting number? It looks like the kind you posted a picture of.
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