/6 1barrel to 2 barrel or just v8 it and forget it
#1334626
11/13/12 10:33 AM
11/13/12 10:33 AM
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Joined: Apr 2004
Posts: 1,093 It's beer:30 somewhere
adventurer
OP
super stock
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OP
super stock
Joined: Apr 2004
Posts: 1,093
It's beer:30 somewhere
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I have an 85 D100 with a /6 1barrel. The truck is nicknamed "The Gutless Wonder" because it won't get out of it's own way. There is no power at all. You basically have to keep it floored to try to run 70mph interstate speed. So I am looking to upgrade a little in the power department. Now I'm not looking to make a hot rod just some reasonable, usable power. I am giving some thought to tring to go to a 2 barrel setup rather than the 1 barrel it came with. My question is, Is it worth the effort or should I just v-8 the truck and forget the old slant six? Will I get a fair amount more power out of the trouble going to two barrel,because of all the linkage change etc... to make it worth it? Anybody did this and have any insite. Thanks
77 Dodge Adventurer SE 440 2wd SWB 78 Dodge Adventurer SE 440 2wd Utiline 90 Dodge D150 SWB 2wd 318fi 4speed 60 Desoto Adventurer 2dr 67 Dodge Dart Gt Conv. 273 4bbl 04 PT Cruiser GT Turbo 14 Ram R/T "Life's to short to drink cheap beer."
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: adventurer]
#1334628
11/13/12 11:06 AM
11/13/12 11:06 AM
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Joined: Oct 2012
Posts: 1,106 Northeast
VincentVega
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super stock
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Northeast
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Then it's either worn out, or something is wrong with it. It could be nothing more than worn out plugs, wires, have retarded timing, need a carb rebuild, etc. Do you maintain it, change the oil, or has it been run into the ground? Does it have a huge exhaust leak? Does it miss? You should barely be off idle to cruise at 70, even in a slant six.
Sure, you can put another motor in, but it would be a lot easier and cheaper to fix up what you got if it just needs some attention.
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: VincentVega]
#1334629
11/13/12 11:19 AM
11/13/12 11:19 AM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
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master
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Posts: 8,020
Pangaea
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Slant sixes are gutless, mine won't pull a loaded 24' enclosed car trailer. It will pull a 4000lb plus '67 Hemi Charger on a 2000lb trailer and it's pulled a 5500lb John Deere tractor on the same trailer before. Then again, I did upgrade to a 2bbl Super Six BBD so I cheated. It gets 20mpg hwy @65mph where my old 318 would only do 17mpg. If your going to V8 it, why not go 440? Compared to a big block, small blocks are gutless! Remember, everything is relative.
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: B5 Bee]
#1334631
11/13/12 11:42 AM
11/13/12 11:42 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Vincent said I'd at least diagnose it & see if it's just worn out or if it has an easily fixable problem. You have other V8 trucks in your sig so you know what's involved in swapping and the power increase you'll have when you're done. Myself if I had several trucks I wouldn't mind keeping one with a /6 but I would want the eng to be in pretty good shape
live every 24 hour block of time like it's your last day on earth
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: B5 Bee]
#1334632
11/13/12 11:49 AM
11/13/12 11:49 AM
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Joined: Jan 2003
Posts: 5,912 Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,912
Athens, Greece
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If you wanna go with the normal wave of people but the Sixes are better on fuel if you get it just right. 1bbl IS a gutless wonder...my 70 Dart had a 225 1bbl. I swapped out to a 2bbl Cast Iron intake and put a 2bbl 500cfm...ran better...not great. I swapped out the cast iron and found a 4bbl Offy Aluminum and ran a 4bbl 390cfm. Ran better and was content...Then I swapped out the atrocious exhaust manifold. Put in the 6-to-1 MP header...Ran better...not great...the #4 pipe had to be crushed to fit the steering pump. Eventually switched out to the Clifford Tri-Y Dual headers. Breathed ALOT better. Sent out a spare cylinder head and had it rebuilt. 5 angle valve job, new large valves (1.61/1.34 IIRC), mild Porting...I wanted to put 5/16" vave stems from a Ford but the guy said it was wasted money. Bolted it on....difference was night and day. Had to get rid of the 390cfm Holley....tossed it and went with a 500cfm Edelbrock.....I broke the rear end. 3 of the 4 spyder gears went bye bye. Don't underestimate the power of a slant. I was taking out small blocks with mine and I was the only muscle car on the road in my area during the gas crunch of 2002/2003. Went back and forth from LA to Vegas on numerous occasions. If you are worried about the linkage, switch to a Lokar for the kickdown or go one and done with a Bouchillion Kit that you can use from a Slant to an RB and set that throttle/kickdown any way you see fit. While you are up to changing things (If you keep the Slant) put in a remote oil filter. I hated bathing my suspension in oil at every oil change More pics on the link in my signature but..
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: Pyper70]
#1334633
11/13/12 11:57 AM
11/13/12 11:57 AM
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Joined: Oct 2012
Posts: 1,106 Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
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Northeast
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That's an awesome setup. I had a Clifford 4 bbl intake on my /6. We fabbed our own carb adapter out of a phenolic blank, and turned it 90 degrees so the primaries were parallel and closest to the driver's fender. I specifically wanted to do this for improved distribution and drivability. Finally, we used chrome drain pipe inserted into the primary holes of the adapter, down into the plenum (not quite to the bottom), and cut them on an angle so as to make the center cylinders' pull from the carb a little bit longer, like the outer cylinders.
It worked great. Carb was from a 273. It was all experimental. A little too much CFM, but it was fine if you waited until about ~3000 to open it wide. We eventually put a (noisy) 3.55 suregrip in it (up from 2.94 w/ wide ratio 904), that made it real fun.
Like you, I started with the super six 2 barrel setup from the pick-yer-part. With an open element air cleaner, it was fun, but the extra 10 or 15 hp wasn't enough.
It was still slow.. but it was ridiculously fun to drive.
The kickdown linkage I kept stock, believe it or not. I had this interesting setup where I had a stock location mount for the kickdown rod up by the carb, and I used a spare throttle cable to translate the motion from the 90 degree rotation back to where it would normally be. It made the pedal a bit hard to push (lol,) but it worked.
I had digital pictures of this. Probably sounds like I'm full of crap.. it was on my college server and I never re-saved them again before they killed my account after grad. oh well. i still have all the parts..
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: adventurer]
#1334634
11/13/12 12:17 PM
11/13/12 12:17 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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I ran a slanty for years in my '68. It ran very well for a slant, but it would only pull down 16 to 18 mpg on the highway at 75mph and 13 to 14mpg around town.
I had a two bbl, slightly ported head with oversized valves, an RV grind cam, bumped-up compression and Dutra Duals. In fact, the motor was done by Doug Dutra.
Like I say, it ran great, but I always wanted more. I ended up pulling it to put in a 2001 360 Magnum with fuel injection and some other mods. I expect to get way more power and equivelant or better mileage when my foot is out of it.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: jbc426]
#1334635
11/13/12 12:21 PM
11/13/12 12:21 PM
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Joined: Oct 2012
Posts: 1,106 Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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Dutra duals! I also have a set of those, never put on yet. Those are rare, not many have them.
This thread is making my head spin a little. I have an aluminum 225 in my garage, packed away. I was going to put it into the car with the 4 bbl I was just referring to (an 81 police dippy) but life got in the way.
I like your fuel line treatment
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: VincentVega]
#1334636
11/13/12 12:36 PM
11/13/12 12:36 PM
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Joined: Jan 2003
Posts: 20,217 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
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Posts: 20,217
Park Forest, IL
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FYI, Doug is still selling Dutra Duals.
OP-as said before, make sure the motor is in proper tune and good condition before you give up.
"Everybody funny, now you funny too."
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: slantzilla]
#1334637
11/13/12 01:10 PM
11/13/12 01:10 PM
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Joined: Jan 2003
Posts: 5,912 Athens, Greece
Pyper70
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master
Joined: Jan 2003
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Athens, Greece
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Quote:
FYI, Doug is still selling Dutra Duals.
I was gonna say...I hope Doug didn't pass on...I used to be pretty avid on SlantSix.org
I wasn't intending on selling my Dart...My next upgrade was the Hyper Pak. I love that look plus the added plenum would have given me a bit more bottom end. As for the rest of the driveline...it was 10:1 motor, Isky Cam with .248 lift I think..904 Trans with a shift kit...8 3/4 out of a B-Body with 3.23s. All in all it was a great experience...if I had to do it all over again I wouldn't miss a beat doing it just like I did so i could learn what the recipe should be. If I had to change any ONE thing...I was gathering up schematics for a Turbo...as you say...Life got in the way....and she now lives in Sydney Australia with her new owner and she is getting prepped for a 383.
Last edited by Pyper70; 11/13/12 01:11 PM.
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: adventurer]
#1334640
11/13/12 03:43 PM
11/13/12 03:43 PM
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Joined: Jan 2004
Posts: 457 Hightstown, NJ
njdevil2
mopar
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mopar
Joined: Jan 2004
Posts: 457
Hightstown, NJ
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Just to add more "fuel" to this fire... I know this is ancient history at this point, but I ran my Demon 225 in Stock NHRA at Englishtown. Took out quite a few small blocks ('74-'82). The national record was 15.2 @ 83 mph at the time. I got it down to 16.92 @ 82 mph and still street driven. Specs' (to my recollection): +30, stock spec/blueprint cam, aluminum 1 bbl intake, hooker headers, 904 manual shift, stock stall converter, 4.10 7.25 rear. Car weighed in about 3300# wet & loaded. Consistantly in the points for 6 years. Obviously, if I had a converter, blueprinted the head it would have been faster.. I did play with dual Holley 1 bbls and it felt faster, but I ouldn't prove it. the slantys can be real torquey for sure. This is interesting, cuz I was just reading an article in Mopar Action about /6 vs small blocks. Bottom line, 318's and 360's are cheap and plentiful and cubic inches trump uber alles...I did love my 225, just the lure of a 340 won out .....
1970 road runner Convertible 1 of 179
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: adventurer]
#1334641
11/13/12 03:43 PM
11/13/12 03:43 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
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master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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FWIW, I was re-curving my slanty's distributor. You know, welding up the advance slots and then filing them back with a small chain saw file that fit just right. It took about 6 tries to find where the motor liked it best.
In my case, one of the greatest low rpm & midrange driveability improvements I made was to recurve the distributor. Mine ended up liking to be set at 25 initial with 32-34 total total. The started never kicked back, it never gas knocked and it really transformed how the car ran off idle and into the midrange. The top end never changed, which is to be expected, as the total timing remained the same.
I also routed the vacuum advance to manifold vacuum. which brings the timing up into the mid 40's at idle and cruise etc. Of course it immediately drops back toward 32 when the throttle is opened.
This was really a game changing adjustment for my motor. It pissed off a lot of close minded, know-it-all guys who have never tried it, but swore it would never work over on the slant 6 forum.
Give it a try, you can always file the slots longer and run less initial if you find it doesn't work for your ride.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: njdevil2]
#1334642
11/13/12 04:21 PM
11/13/12 04:21 PM
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Joined: Jan 2003
Posts: 5,912 Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,912
Athens, Greece
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At the time of all my modifications...I had 4 383s in the garage...two 440s....and I went out purposely and bought a 340 to make a 340 Swinger clone. The Slant prevailed because it was the underdog. I sold the 383s...both 440s went into both Chargers and the 340 was sold for quite the return on investment. I had all the parts there....and still didn't follow through...Now even Slant parts are scarce and slowly rising in price.
If you start wanting crazy parts for the Slant look up Cox Bros out of Ohio...I remember buying bearings, timing sets, rocker arms etc..not cheap...but they were made in the USA
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: /6 1barrel to 2 barrel or just v8 it and forget it
[Re: DaytonaTurbo]
#1334644
11/13/12 07:11 PM
11/13/12 07:11 PM
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Joined: Mar 2005
Posts: 1,547 Seattle, WA
375inStroke
Special needs person
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Special needs person
Joined: Mar 2005
Posts: 1,547
Seattle, WA
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Friend's /6 '67 Barracuda ran 20 in the quarter. Put a 2bbl and header on and ran 18sec in the quarter, but his gas mileage dropped from somewhere in the 20s, to 14mpg. Went 360, gas mileage stayed the same, but now in the 14s. Then went 440, and same mileage, in the 14s still, but a lot faster MPH. He couldn't hook, but a lot more fun to drive. These were all with bone stock, worn out motors, except for the /6 header.
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