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Old 08-04-2019, 05:27 PM   #1
hunterpardue
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Default Should I change my 4bbl to a 2bbl

I recently purchased a 1980 Scout 2. 304 with a 2 bbl intake. The carb is a 4bbl carter with some type of conversation kit to adapt to the 2bbl intake. No issues with starting the truck, idles fine, but shifting from drive to reverse causes the engine to stall. I took the truck to a mechanic thinking there may be a vacuum leak. The mechanic
Reported back that he did a smoke test and could not find a vacuum leak. His recommendation was the rebuild the carb. After reading other threads on this forum I am now questioning if I should scrap the 4bbl and go with a 2bbl Holley carb. Looking for more expert advice on if this is a good decision? Should I make the change? What will I gain/lose?
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Old 08-04-2019, 09:14 PM   #2
Scoutboy74
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Default Re: Should I change my 4bbl to a 2bbl

You won't be out anything, except the money for a new carb. 4bbl carbs weren't designed to work on 2bbl intakes. The adapter is clumsy stop-gap measure. Your best bet is to make the carb and intake match without an adapter.
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Old 08-05-2019, 05:42 AM   #3
hunterpardue
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Default Re: Should I change my 4bbl to a 2bbl

I think that is the route I am going to go. From what I'm reading the motorcraft carb is pretty well liked. Is there a thread that would discuss the installation of a Motorcraft carb. I would need to know if I can just pull my old carb and adapter and directly bolt on the new carb? If there are any other parts I need to purchase and what the gotchas might be? Is this a task that can be tackled by a newbie? or would it be wiser to let a more experienced mechanic tackle this task?
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Old 08-05-2019, 06:06 AM   #4
Scoutboy74
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Default Re: Should I change my 4bbl to a 2bbl

The IH 2bbl intake is a common pattern that will accept any Holley or Motorcraft 2bbl carb. I know plenty of folks have gone with the Motorcraft on an IH engine. I'm more familiar with the Holley 2300 350 cfm size in either list 0-7448 or 80350. Either of those are known to do quite well on these engines right out of the box. Throttle linkage will likely need to be modified slightly in any event, but not rocket science. If you go with the Holley, you definitely want to install a base gasket with heat shield provision that forms a heat dam between the intake and the fuel bowl. It's an easy job overall.
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Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVW/12K# winch
Hooty - '74 SII 4x4 - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/33g Fuel
Lemuel - '73 1210 Reg Cab 4x4 CS - 304/TF727/NP205/4.09 FA25 & 4.10 RA16/6800# GVW - "Pull Lemuel, pull!"
Organ Donor - '72 1210 Reg Cab 2WD - seized 392/TF727/7500# GVW - "Use my body to keep you alive!"
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Old 08-10-2019, 06:03 AM   #5
hunterpardue
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Default Re: Should I change my 4bbl to a 2bbl

Can you post a picture of how you modified your linkage
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