1bbl to 2 bbl
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Junior User
Joined: May 2013
Posts: 60
Likes: 1
From: Kernersville, NC
1bbl to 2 bbl
So i have already switched to a hei ingtion and distributor, can i replace my 1bbl carb with the 2 barrel with adapter plate? I know its not the best combo but i dont have the money to drop for a 4bbl and and new manifold. Does anyone have experience that have done it or pictures?
Adapter Plate-
https://www.summitracing.com/parts/t...0aApo_EALw_wcB
Carb-
https://www.ebay.com/i/252710718684?chn=ps&dispItem=1
Adapter Plate-
https://www.summitracing.com/parts/t...0aApo_EALw_wcB
Carb-
https://www.ebay.com/i/252710718684?chn=ps&dispItem=1
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
You definitely can go that route and it'll fit, but the main issue is that the stock manifold is quite restrictive. So, even though you'll have a 2bbl on there, it's not going to let a whole lot more air/fuel through.
It's like blowing air through a drinking straw. Even if you get someone with a bigger lung capacity, you still can only get so much air through the straw. You have to make the straw bigger at some point to really benefit.
It's like blowing air through a drinking straw. Even if you get someone with a bigger lung capacity, you still can only get so much air through the straw. You have to make the straw bigger at some point to really benefit.
Elder User
Joined: Apr 2012
Posts: 544
Likes: 6
From: Kalispell, MT
i have done it. it does make a noticeable difference. I ran a 2 bbl mc2150 w/ an adapter on top of an edelbrock intake for a while. Its nothing like an offy intake with a 4 bbl, but there are gains to be had by just going to a 2 bbl.
if you like to drive it like you stole it, and want more tuneability, save up for an offy and nice holley.
if budget is more of a concern, and you feel like you need to upgrade now, the 2 bbl swap is a good compromise.
if you like to drive it like you stole it, and want more tuneability, save up for an offy and nice holley.
if budget is more of a concern, and you feel like you need to upgrade now, the 2 bbl swap is a good compromise.
Elder User
Joined: Apr 2012
Posts: 544
Likes: 6
From: Kalispell, MT
yes sir that is correct. I'm not sure of any quantifiable data of specific gains...nor did I run it on the dyno before or after. I did feel significant differences across all rpms and throttle positions. it's nothing like the offy C / QF setup I have now...but its a couple steps above stock for sure.
Thread Starter
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Junior User
Joined: May 2013
Posts: 60
Likes: 1
From: Kernersville, NC
Thanks for the complaint and appreciate you guys input, ive been doing everything in stages, the ultimate goal will be the 4bll and intake but i had to start from the beginning because of the feedback carb but even the one barrel non feedback was a significant gain being able to properly tune it finally.
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Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
https://fordsix.com/ci/LogMods.html
That is a Tech article on converting to 2V from 1V. One can use adapters but the better remedy might be to mill the intake to accommodate the 2V. You will have to scroll down a ways to get to the pictures of that kind of conversion.
That is a Tech article on converting to 2V from 1V. One can use adapters but the better remedy might be to mill the intake to accommodate the 2V. You will have to scroll down a ways to get to the pictures of that kind of conversion.
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Cross-Country
Joined: Feb 2015
Posts: 64
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From: N.W.WYO
That adapter in the Summit link (2025) is for the real small Rochester 2gc four bolt pattern, and some others. The ford 2 barrel carbs and some Hollys are much larger. I ran a 2100 ford on a Toyota Landcruiser jetted down to I think 46's and got 20 mpg when conditions were just right. It was off of a 67 bronco 289, and had the small bores.
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Junior User
Joined: May 2013
Posts: 60
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From: Kernersville, NC
found this post is a real good read of someone who has done it, alot of info together
https://www.ford-trucks.com/forums/9...00-4-9l-2.html
https://www.ford-trucks.com/forums/9...00-4-9l-2.html
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