Super 6 conversion

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plymouth71

plymouth71

The Moomobile
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Hey guys I was just wondering if changing the stock single barrel to a super six was a good idea.Does it help a /6 a lot or somewhat.If I done this I know the intake,linkage and kick down has to be changed but what about the Exaust manifold,will the stock work or will it have to be changed as well.Also what am I looking at price wise if I decide to do this,I have the 2bbl carb and air cleaner but nothing else.Thanks
 
It does help, but it is not huge. As you are aware, the throttle linkage and kickdown linkage need to be changed. Also the choke is different.The stock exhaust manifold is the same as what is used on the super six. Prices for the super six intake have gotten kind of pricy, lately. You just need to shop around, to find a reasonably priced intake.
 
Charrlie_S said:
It does help, but it is not huge. As you are aware, the throttle linkage and kickdown linkage need to be changed. Also the choke is different.The stock exhaust manifold is the same as what is used on the super six. Prices for the super six intake have gotten kind of pricy, lately. You just need to shop around, to find a reasonably priced intake.
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Thanks for the imfo,I thought about going super6,also thought about dropping in a v-8 but the motor is original with all matching numbers.Ive been told by several friends to leave motor in,because you hardly ever see a scamp with a v6.But as for now I'm looking into a few options and ideas.
 
If you are interested in keeping it as original looking as possible but getting a little more zip, you can change the cam to a torque grind, shave the head and work on the airflow there, ad a 2.25" exhaust, and keep the 1 BBL, and it will be a noticeable increase. But that is all internal work, not bolt on stuff.
 
nm9stheham said:
If you are interested in keeping it as original looking as possible but getting a little more zip, you can change the cam to a torque grind, shave the head and work on the airflow there, ad a 2.25" exhaust, and keep the 1 BBL, and it will be a noticeable increase. But that is all internal work, not bolt on stuff.
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I would like to keep it as stock as possible,Thanks I'll keep that in mind
 
The choke pulloff well on the Super Six exhaust manifold is different. To use the choke thermostat for the 2bbl carb, you either need the Super Six exhaust manifold, or you need to cut away the side of the well on the standard 1bbl manifold. Or you can use the electric choke that was on later models. There is a good article at slantsix.org that explains this in detail.
 
mvh said:
The choke pulloff well on the Super Six exhaust manifold is different. To use the choke thermostat for the 2bbl carb, you either need the Super Six exhaust manifold, or you need to cut away the side of the well on the standard 1bbl manifold. Or you can use the electric choke that was on later models. There is a good article at slantsix.org that explains this in detail.
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Thanks,if I go with the super6 I will try to get the intake/Exaust as a unit,but from what I've seen just getting the whole setup is going to be a small fortune,but I'm in no hurry,so I'll keep looking around
 
In 94 I rebuilt a 225 to replace the tired one in my 1980 Volare. I bought a 77model parts car with a supersix . I asked the builder to pump up the compression to at least 9.5 and move up a cam size or two. I never measured anything, cuz I wasn't looking for a performance increase.The performance increase that I did get,after much tuning,was marginal at best.
Some time later,I installed a wide-ratio 904, a looser TC, and upped the rear gears.All stuff I had laying around).That was a way better deal. If I had it to do over, I would do the gears and TC first. The engine had to be done. But I'd leave the SS stuff for last. I will say though that the 2bbl can make great gas mileage..
 
AJ/FormS said:
In 94 I rebuilt a 225 to replace the tired one in my 1980 Volare. I bought a 77model parts car with a supersix . I asked the builder to pump up the compression to at least 9.5 and move up a cam size or two. I never measured anything, cuz I wasn't looking for a performance increase.The performance increase that I did get,after much tuning,was marginal at best.
Some time later,I installed a wide-ratio 904, a looser TC, and upped the rear gears.All stuff I had laying around).That was a way better deal. If I had it to do over, I would do the gears and TC first. The engine had to be done. But I'd leave the SS stuff for last. I will say though that the 2bbl can make great gas mileage..
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sorry I'm at a loss.. TC?
 
I have never done a 2bbl conversion with out a bunch of engine mods so, I can't tell you how much it helps alone...the best bolt on mods I have made on a slant is the HEI conversion and distributor recurve. Over at the .org people have done a lot stuff with 1bbl. Usually when I do the 2bbl thing, I use a motorcraft 2100 or a holley 350.

The other things mentioned in the previous posts(especially rear end ratio) are the often forgotten mods that make ALL the difference.

For example: I had a 59 F100 that I THOUGHT had 4:10 rear end in it. Had the original 223/3 speed manual in it, sucked to drive...put a 289/3 speed into it, still sucked. Swapped in a 360/904, thought I had it...still sucked. Checked the rear end again...it was 3:00 ratio. Switched to a 3:55 rear with the 360 and made a new truck out of it. If I had put 3:73 or better with the original 6, probably never would have taken it out. Just to illustrate how important rear end ratio is.

And YES I should have checked the rear way before I did all the engine work. I was young and dumb, and like engines.

sb
 
I think every slant six in a car should have a two barrel on it, it really helps unless you have a truck van or wagon the one barrel will give it some torque to move more weight. But convert it over to electronic ignition bigger exhaust a new timing chain and a two barrel set up and you'll never go back.
 
Slantsix64 said:
I think every slant six in a car should have a two barrel on it, it really helps unless you have a truck van or wagon the one barrel will give it some torque to move more weight. But convert it over to electronic ignition bigger exhaust a new timing chain and a two barrel set up and you'll never go back.
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I really liked mine in my 82 1/2 ton...BBD and 833OD. Truck came with it and lean burn. Got rid of lean burn and it was a great truck.

sb
 
If you are paying $300+ for the SS setup it is absolutely not worth it. I would go bigger exhaust pipe, HEI and compression. You will see a bigger difference vs the 2bbl alone.
The stock 1bbl won't be a limiting factor until you get into the cam/head and supporting mods.

I had a 67 block with the stock cam, holley 1920,9.5 to 1 comp that ran much better than a 70 Dart with just the Super Six and 2 1/4" exhaust pipe off of the manifold.
 
Talking about the Super Six conversion is of great interest to me. My 70 Challenger with Slant6 was my daily driver before I retired. DD from 1973-2005 enmassing 562K miles on the clock. Since I drove an E-body with a six, it deserved a mild performance increase. So in the late 80’s I changed over to a SuperSix set-up from a ‘77 Volare with a Carter BBD 2 bbl. directly after came Mopar elec. ign. W/ orange box and Accel HO coil. 14X3 open element K&N air filter w/ SuperSix decal. Then Hooker headers 3into1 dual exhaust 2.25 SS pipe w/ H pipe cross over then to back of car. The rest of drive train is 904 Auto. w/ B&M shift improver, 8 3/4 742 case, 3.23 gear set. 11” drum brakes. Picked up a Nippondenso light weight starter to put in. It idles great sounds great and has great pick up. I’m pleased with just these changes. Have an Offy manifold w/ 390CFM 2 bbl sitting on the bench waiting in the wings.
 
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