All Small Six 1966 200ci in Mustang, General advice needed

This relates to all small sixes
Hi all, I've been lurking on the forums for a few years now reading occasionally about different mods and info about the small block inlines. I've had the stock 200ci Inline 6 in my 1966 Mustang as long as I've had it, the entire car is original, and the engine runs like a dream after some light work. It has about 110,000 miles and is currently sitting while the C4 trans is rebuilt by a local shop.

I'm basically wondering what most people are when they first post, how can I start to give it a little more power for acceleration and comfortable driving? I considered buying a T-5 at Ford Motorsport Nationals earlier this year but held off, I honestly just enjoy automatics for cruising around and I sometime drive the Mustang to work.

It honestly runs like a dream, its only issue is starting sometimes, taking 2 or 3 tries, but it does have a stock 1 barrel carb. It also sounds great, no taps, and the exhaust sounds real mean for something with such low displacenent.

It has all original components, originally paired transmission, everything. I saw the following things as highly recommended changes on a few threads and just wanted to verify them, and make sure I've understood:

1. A post 1977 US 200ci/250ci head is the only real way to improve the intake without a good Aussie or Argie connection, or insane fabricating skills.
2. Headers look cool but with the small log it's kind of just for looks.
3. Carb adapter plates to put a 2-barrel on it will not really make any difference.
4. The stock Load-o-Matic distrubutor is aparently awful and if replaced, will make it easier to start (or run better in general? seen some dispute).
5. Changing the rear gearing could get it to accelerate faster but hurt its highway potential (which isn't ideal for me).

I've been driving it 7 years now, and just want to give it a lil boost for quality of life. I'm not expecting to turn it into a 1ci to 1hp beast, and to be honest I generally wanted to avoid super modern mods like EFI if I can help it. I've pretty much only modded things like speakers and the radio, and even then I sourced an older premium radio for it with a casette deck. The whole thing is basically very lightly modified or fully stock, with the most modern changes being new rims and speakers in the back pannel above rear seat.

I'm also open to any general suggestions about the car! I've never really used a forum, so it'll be neat to hear more from others. I've not figured how to post pictures yet, but once I do I'll post a little collage of the car. Its original paint, but absolutely no clearcoat left, very patina'd, springtime yellow with black vinyl hardtop.

Thanks,
Lyev
 
Welcome!! I have a 67 mustang with a 200 3 speed. I changed the carb to a Webber 34/36 and adapter and a DUI distributor, stock exhaust. It made a noticeable difference. It still wasn’t fast, but just felt better driving it. Good drivability 👍. I got it from Clifford performance, tell them what you have for an engine and they will pretune it. Install is fairly simple, we can help with that when the time comes. I would say you get the most bang for your buck and most do it yourself mod there is
 
Welcome!! I have a 67 mustang with a 200 3 speed. I changed the carb to a Webber 34/36 and adapter and a DUI distributor, stock exhaust. It made a noticeable difference. It still wasn’t fast, but just felt better driving it. Good drivability 👍. I got it from Clifford performance, tell them what you have for an engine and they will pretune it. Install is fairly simple, we can help with that when the time comes. I would say you get the most bang for your buck and most do it yourself mod there is
Sounds like a solid path! I'll put that on a lil list of plans then, I'll look into Clifford for that! Thanks for the quick reply and good info!
 
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Hi all, I've been lurking on the forums for a few years now reading occasionally about different mods and info about the small block inlines. I've had the stock 200ci Inline 6 in my 1966 Mustang as long as I've had it, the entire car is original, and the engine runs like a dream after some light work. It has about 110,000 miles and is currently sitting while the C4 trans is rebuilt by a local shop.

I'm basically wondering what most people are when they first post, how can I start to give it a little more power for acceleration and comfortable driving? I considered buying a T-5 at Ford Motorsport Nationals earlier this year but held off, I honestly just enjoy automatics for cruising around and I sometime drive the Mustang to work.

It honestly runs like a dream, its only issue is starting sometimes, taking 2 or 3 tries, but it does have a stock 1 barrel carb. It also sounds great, no taps, and the exhaust sounds real mean for something with such low displacenent.

It has all original components, originally paired transmission, everything. I saw the following things as highly recommended changes on a few threads and just wanted to verify them, and make sure I've understood:

1. A post 1977 US 200ci/250ci head is the only real way to improve the intake without a good Aussie or Argie connection, or insane fabricating skills.
2. Headers look cool but with the small log it's kind of just for looks.
3. Carb adapter plates to put a 2-barrel on it will not really make any difference.
4. The stock Load-o-Matic distrubutor is aparently awful and if replaced, will make it easier to start (or run better in general? seen some dispute).
5. Changing the rear gearing could get it to accelerate faster but hurt its highway potential (which isn't ideal for me).

I've been driving it 7 years now, and just want to give it a lil boost for quality of life. I'm not expecting to turn it into a 1ci to 1hp beast, and to be honest I generally wanted to avoid super modern mods like EFI if I can help it. I've pretty much only modded things like speakers and the radio, and even then I sourced an older premium radio for it with a casette deck. The whole thing is basically very lightly modified or fully stock, with the most modern changes being new rims and speakers in the back pannel above rear seat.

I'm also open to any general suggestions about the car! I've never really used a forum, so it'll be neat to hear more from others. I've not figured how to post pictures yet, but once I do I'll post a little collage of the car. Its original paint, but absolutely no clearcoat left, very patina'd, springtime yellow with black vinyl hardtop.

Thanks,
Lyev
Sounds like a solid Mustang. While your C4 is in the shop their are parts to make it shift with more of an emphasis on performance. And check out the link below to see results using a small log head. It did require replacing the cam but hp/torque gains are impressive. Without the cam there should also be significant gains. Just read all the recent posts on here a few guys are hopping up their 200 Mustangs, including T5 trans, with good results but also important are the suspension and brake upgrades in progress for much improved handling. Just keep reading and asking questions and the guys actually getting this accomplished or have done it will help you.

 
Sounds like a solid Mustang. While your C4 is in the shop their are parts to make it shift with more of an emphasis on performance. And check out the link below to see results using a small log head. It did require replacing the cam but hp/torque gains are impressive. Without the cam there should also be significant gains. Just read all the recent posts on here a few guys are hopping up their 200 Mustangs, including T5 trans, with good results but also important are the suspension and brake upgrades in progress for much improved handling. Just keep reading and asking questions and the guys actually getting this accomplished or have done it will help you.

I'll be sure to give the thread a good read! I'm just going with a general rebuild of the C4, I hadn't considered messing with gearing too much, but the guy I took it to is locally well known for rebuilding and modding transmissions, I'll ask him a bit about it when I see him this week, I just dropped it off last Friday after getting it out myself in the driveway.

You're definitely right about brakes and suspension, I've gotta get new leafs for the back I think, but the drums all feel real solid to be honest, brakes actually don't take too much pressure to stop, maybe I just got used to it since its my first car.

I'll def keep asking more questions and reading more! I'm pretty insistent on keeping it an inline, and have been since I got it!
 
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Good to hear.
The trans thing is a simple addition and were commonly known as a shift kit I believe. Your trans guy will know all about it.
 
I also have a 66 mustang with a C4 auto. I recently did a conversion to electronic ignition using a junkyard duraspark distributor, HEI module and a high energy coil. I also went to manifold vacuum for advance. I spent some time playing with lighter springs so full advance comes in a bit earlier that the stock setup.

The resulting cold starts and drivability are greatly improved. It starts up on the first crank almost every time and I am getting crisp throttle response off of idle.

For the low $ spent, it was 100% worth the effort.
 
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