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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 01-16-2009   #1 (permalink)
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Default 1966 Mustang 200ci auto 1 barrel to 2 barrel

I'm a newbie here-
I currently own a 66 coupe with a 200 ci six and an auto transmission. The carb is old and in need of a rebuild and thought why not upgrade to a two barrel. My local speed shop recommended a Holley 0-7488 with an adapter plate and electric choke. Anyone done this conversion and have an opinion on this set up? Any linkage problems? Fuel inlet? Drivability? Hood clearance? Any alternatives to this set up that work well?
Any comments will be appreciated.- johno66
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Unread 01-17-2009   #2 (permalink)
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Welcome to the site!!!!Check out the classic tech section.
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Unread 01-17-2009   #3 (permalink)
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Enjoy the site!! :happydancer:

Lets try this forum!
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Unread 01-17-2009   #4 (permalink)
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I put a Offy 3 carb intake on mine: it was very cool but required a lot of machine work. It was a hassle but since the car wasn't a daily driver it was worth the effort. It placed a carb directly over a pair of intake ports. I used a prgressive linkage and a choke on the center carb only. Ran great in the summer at WOT. Ran very poorly in the winter.

Biggest problem with the 200-6 IMO is the tiny integral intake. Additionally cylinders 1 and 6 are a long way from the carb.
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1966 Mustang 200ci auto 1 barrel to 2 barrel-bad200.jpg  
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Unread 01-17-2009   #5 (permalink)
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Check out this thread on 1bbl to 2bbl carb conversion and some tech discussion at fordsix.com. These guys really know how to hop up that Ford six. It might give you some ideas:

Changement de carburateur

Fordsix Performance :: View topic - Weber Reference Table - Work In Progress

I've also attached a pretty good how-to I found on the web sometime back.

Good luck!
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File Type: pdf Adapting Holley_Weber Carbs to the 144 -200 Ford six.pdf (226.0 KB, 1262 views)
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Unread 03-16-2009   #6 (permalink)
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welcome to the site. i to own a 200ci. have fun!!!!! check out the tech part of the site
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Unread 03-17-2009   #7 (permalink)
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I agree that the Ford Six Performance site has some great info. A word of warning though: you may find your project grow into something crazy. I started looking at that site looking for a few simple things to do and now I'm in the process of planning out an upgrade to a aluminum cylinder head, more aggressive cam and some other components.

You shouldn't have any clearance issues. The six sits low enough in the bay that you'll have plenty of room.
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Unread 03-18-2009   #8 (permalink)
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Don't use an adapter plate. All the companies I found reviews for said the adapters leaked alot. Save up, get the head from a 250 straight six, then go to classicinlines.com . They make special intake manifolds that are safer than a leaky adapter plate. I am saving up to get my car redone using one of their kits.
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Unread 03-19-2009   #9 (permalink)
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To put a Ford or Holley 2 bbl carb on the six you need to mill for a small rochester 2 bbl to Ford or Holley adapter. It is a flat adapter and when the manifold log is milled flat to mount the adapter andf then the hole opened up for the 2bbl carb it adds a lot of performance.
I hope the picture works....
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1966 Mustang 200ci auto 1 barrel to 2 barrel-2bbladapter.jpg  
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Unread 04-02-2009   #10 (permalink)
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I used a Carter YF from a 79 Granada on my 65 coupe with 200. The carb came from a 250 engine and was considerably larger. Still a 1-barrel. I had to cone shape my carb spacer, $20 at wrecking yard, $20 for a carb kit and new float. $40 bucks and it has a lot more power. Just a cheaper upgrade option.
Mike
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Unread 07-10-2009   #11 (permalink)
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What type of Linkage modifications were required for the Carter YF
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Unread 07-10-2009   #12 (permalink)
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welcome to the site and as stated there are a lot of things that can be done to the 6 and be sure to check out fordsix.com.
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Unread 07-12-2009   #13 (permalink)
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Default 2 Barrel Holley On Log Manifold

Its best to start with a head 78 or newer.
Need to mill the head at least .070" to get the cc's back to close to 52 rather than 60 cc's.
Use Victor head gasket which is .044" thickness crushed. Carquest has them.
The intake log will have to have the low spots filled in by brazing so when the single barrel mount is milled off you will have sufficient surface for the seal to a custom made holley 2 barrel adapter.
http://img.photobucket.com/albums/v2...11/head_1_.jpg
http://img.photobucket.com/albums/v293/wsa111/head2.jpg
http://img.photobucket.com/albums/v2...changejets.jpg
http://img.photobucket.com/albums/v2...1/DSC_0039.jpg
http://img.photobucket.com/albums/v2...2009-01-18.jpg
http://img.photobucket.com/albums/v2...00040001_1.jpg
You can use a 7448-350 holley & rejet to 59-60 jets
I use a 4412-500 holley with custom installed annular nozzles for better response & power.
http://img.photobucket.com/albums/v2...7Mustang-1.jpg
My engine had flat top pistons which bring the compression ratio to 10.4-1. Camshaft during the chassis dyno test was a 274 degree camshaft with 1.6 roller rocker arms.
The little engine put out 145 HP at the rear wheel with a C-4 trans, so the engine was putting out about 180 flywheel power.
Cost wise its cheaper to install a V-8, but the six does get good fuel miliage. Bill
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Unread 07-31-2009   #14 (permalink)
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ive got a pony carbs vaporizer for sale... its has about 10 miles on it and looks bran new.... 300 bucks and ill ship it... its a great carb and easier swap then a 2 bbl...6197506519-matt
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