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Will a /6 904 bolt up to a 318?--UPDATE #110153
08/25/08 05:12 PM
08/25/08 05:12 PM
Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart Offline OP
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340727dart  Offline OP
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The /6 in my '71 Swinger is pathetically slow. It still gets 17 to 18 mpg in town but, dang, it takes forever to get up to speed.
And, it does not like running 70 mph on the Interstate.
So, I figured to locate a 318/2v and swap it into the car.
It would be great if I can use the 904 currently in the car.

Last edited by 340727dart; 08/30/08 04:25 PM.

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Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110154
08/25/08 05:39 PM
08/25/08 05:39 PM
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Lincoln Nebraska
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RapidRobert Offline
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unfortunately no it wont.


live every 24 hour block of time like it's your last day on earth
Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110155
08/25/08 05:43 PM
08/25/08 05:43 PM
Joined: Sep 2005
Posts: 12,481
Chino Valley
RodStRace Offline
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Chino Valley
NO. The 318 will require special mounts or a V8 K member too.
Try really tuning the /6. a '71 should have a solid cam. Run the valves, do a full ignition tune-up and check out the carb. Change the filters. Also make sure the exhaust isn't plugged.
Empty out the interior and trunk of extra junk, get an alignment. Run the tires at 35 PSI.
Have you changed the ATF and rear lube?

Re: Will a /6 904 bolt up to a 318? [Re: RodStRace] #110156
08/25/08 05:52 PM
08/25/08 05:52 PM
Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart Offline OP
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340727dart  Offline OP
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Arkansas
Quote:

NO. The 318 will require special mounts or a V8 K member too.
Try really tuning the /6. a '71 should have a solid cam. Run the valves, do a full ignition tune-up and check out the carb. Change the filters. Also make sure the exhaust isn't plugged.
Empty out the interior and trunk of extra junk, get an alignment. Run the tires at 35 PSI.
Have you changed the ATF and rear lube?




I know about the differences in the K-members and motor mounts.
And, I stay on top of the tune up with the slant. I recently converted to a Pertronix ignition. All the filters are new, I ran the valves about a month ago.
There is nothing in the trunk. I've changed all the fluids within the past month as well.
Let's face it, brand new, the engine put out only 145 gross horsepower.
That means it probably nets about 115 to 120 at the rear wheels.
Given that the engine now has about 94k miles on it, it's probably down to 100 rwhp.
The car probably weighs over 3000 lbs.
That combination, along with 2.94 rear gears, just does not lend itself to fun driving.
And, at times, it gets downright scary when trying to keep up with the flow of traffic.
I figure I can pick up a good, complete, 318 for less than the price of just a Super Six set up and still get decent gas mileage.


Your life is not my fault.
My life is none of your business.

Speech is free only if you agree with those in control.
Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110157
08/25/08 06:05 PM
08/25/08 06:05 PM
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Posts: 560
MI
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marklock Offline
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MI
My 72 Swinger with the slanty ran really well. Again with a good tune up and such it more than got out of its own way on the express way and around town. Maybe it was a freak or something, and no way do I mean it was fast, just a cool around town car.

Re: Will a /6 904 bolt up to a 318? [Re: marklock] #110158
08/25/08 10:52 PM
08/25/08 10:52 PM
Joined: Sep 2005
Posts: 12,481
Chino Valley
RodStRace Offline
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Chino Valley
Sorry, didn't mean to offend, but straight 6s and slants are known as torque motors and they will rev, so when I hear no low end and no top end, I go to the basics..

The 2.76s might be the real cause. See if you can try 3.23s or 3.55s.

Re: Will a /6 904 bolt up to a 318? [Re: RodStRace] #110159
08/26/08 12:00 AM
08/26/08 12:00 AM
Joined: Feb 2007
Posts: 42
Oregon
FarDarter Offline
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Oregon
No, screw that slant six and go with the 318. That's exactly what I'm doing and I'm behind you 100 percent. They may be tough and all that but /6's are dogs. You probably have a decent chance of finding a whole driveline from a V8 car or at least the engine+trans combo. I found a 318 and 904 combo from a running car for $250. Hopefully you can do the same. Good luck!

Re: Will a /6 904 bolt up to a 318? [Re: FarDarter] #110160
08/26/08 12:11 AM
08/26/08 12:11 AM
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Posts: 142
littlestown pa
dustpan man Offline
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littlestown pa
y a 318 tho put a 360 in it if u want more but if i was u i would turn timming up a 318 has no more power then a 225 but u do a tune up get different gears like 323s or 355s youl like it trust me u can chrip every gear i did the same save some money and you should be getting 24 to 26 miles to the gal of gas

Re: Will a /6 904 bolt up to a 318? [Re: FarDarter] #110161
08/26/08 12:23 AM
08/26/08 12:23 AM
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Posts: 3,535
Canuckville
68Cbarge Offline
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Canuckville
The slanty can make power and still be a miser.
Check out the Slant Six Forum.
They do have a recipe that can give you power and economy.

http://www.slantsix.org/articles/articles.htm

Between 1978 and 1981,Ma used a 2bbl intake and carb,and 2-1/4" exhaust for more power and torque.Yet it still maintained good fuel economy.
A common swap is to install the Super six gear on an older slanty,recurve the dizzy,install a clutch fan and shroud.
Plus -as mentioned-go with 3.23's in the rear.
It will run forever and make more power than smogged up late model 318 in a 5Th or Dippy.


'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!
Re: Will a /6 904 bolt up to a 318? [Re: RodStRace] #110162
08/26/08 03:01 AM
08/26/08 03:01 AM
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Posts: 292
dead center
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CHRONiklyDEMONic Offline
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Quote:

slants are known as torque motors






"After a Day filled with burning Rubber, you may find it time to re-tire."
Re: Will a /6 904 bolt up to a 318? [Re: CHRONiklyDEMONic] #110163
08/26/08 07:17 AM
08/26/08 07:17 AM
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Upper Midwest
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MoparforLife Offline
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Upper Midwest
Leaning tower of power.

Re: Will a /6 904 bolt up to a 318? [Re: MoparforLife] #110164
08/26/08 08:30 AM
08/26/08 08:30 AM
Joined: May 2003
Posts: 15,487
Florida
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scratchnfotraction Offline
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Florida
add a super six intake and 2-v carb

add a high stall tc to it

change the rear gear

the 3 best things I have done for my slants,its the best way to get a stock /6 to run and still be stock

Re: Will a /6 904 bolt up to a 318? [Re: RodStRace] #110165
08/26/08 12:08 PM
08/26/08 12:08 PM
Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart Offline OP
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340727dart  Offline OP
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Arkansas
Quote:

Sorry, didn't mean to offend, but straight 6s and slants are known as torque motors and they will rev, so when I hear no low end and no top end, I go to the basics..

The 2.76s might be the real cause. See if you can try 3.23s or 3.55s.




No worries. I asked for advice. You offered yours. You certainly didn't offend me.
But, I am still looking for a 318/904 combo.


Your life is not my fault.
My life is none of your business.

Speech is free only if you agree with those in control.
Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110166
08/26/08 12:55 PM
08/26/08 12:55 PM
Joined: Jan 2003
Posts: 20,180
Park Forest, IL
slantzilla Offline
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Park Forest, IL
Mine runs OK.


"Everybody funny, now you funny too."
Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110167
08/26/08 01:02 PM
08/26/08 01:02 PM

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Anonymous
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Slant 6 is no ball of fire, but it really shouldn't have a problem keeping up with traffic or cruising at 70. 2.94 gears work well with a slant, and 94,000 miles isn't that much, either.

I have to wonder about the condition of your timing chain/gears, or if your muffler is plugged (they CAN corrode internally).

Lots of work/expense to swap in a 318; if you're only looking for a stock 318 power level, you can get that in a slant 6 with a 2bbl carb, mild cam, and bigger exhaust pipe.

Re: Will a /6 904 bolt up to a 318? #110168
08/26/08 02:59 PM
08/26/08 02:59 PM
Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart Offline OP
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340727dart  Offline OP
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Quote:

Slant 6 is no ball of fire, but it really shouldn't have a problem keeping up with traffic or cruising at 70. 2.94 gears work well with a slant, and 94,000 miles isn't that much, either.

I have to wonder about the condition of your timing chain/gears, or if your muffler is plugged (they CAN corrode internally).

Lots of work/expense to swap in a 318; if you're only looking for a stock 318 power level, you can get that in a slant 6 with a 2bbl carb, mild cam, and bigger exhaust pipe.




How can I check the condition of the muffler? I put my hand over the tail pipe with the engine idling yesterday and it sure seemed like it was moving a good amount of air.
The muffler and tail pipe have been changed at some point in the car's life prior to my owning it.
As far as the 318, I was planning on port matching the heads and intake manifold, along with smoothing (not porting) the intake and exhaust ports, then smoothing the exhaust manifolds as much as possible and going with dual 2 1/4" exhaust.
I've been looking at Super Six parts and they seem to be more expensive than a good used 318.


Your life is not my fault.
My life is none of your business.

Speech is free only if you agree with those in control.
Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110169
08/26/08 03:49 PM
08/26/08 03:49 PM

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Anonymous
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Quote:

How can I check the condition of the muffler? I put my hand over the tail pipe with the engine idling yesterday and it sure seemed like it was moving a good amount of air.
The muffler and tail pipe have been changed at some point in the car's life prior to my owning it.




Try holding your hand over the tail pipe while someone in the car revs the engine up. Should get a nice increase in volume if it's not clogged. Of course you could just cut the muffler off and see if it runs any better.

Quote:

As far as the 318, I was planning on port matching the heads and intake manifold, along with smoothing (not porting) the intake and exhaust ports, then smoothing the exhaust manifolds as much as possible and going with dual 2 1/4" exhaust.




Hmmmm, other than dual exhaust, I don't see these mods doing much for an otherwise stock 318.

Quote:

I've been looking at Super Six parts and they seem to be more expensive than a good used 318.




Yeah, costs about as much to hop up a slant 6 as it does a 318, and at the same level of mods, the 318 would make more power. V-8 swap would still be more expensive (and time-consuming) because you'll have issues other than just the engine/tranny - lot of little things, exhaust, radiator, k-frame, center link, throttle and kickdown linkage, etc. etc. And if you upgrade the 318 to make much more power than stock, then you are looking at a rear end swap, plus upgraded suspension/brakes etc.

I converted my 67 Barracuda from Slant 6 to 360, so I'm not wedded to keeping a slant; just want to give you a heads up about what you would be getting into.

Re: Will a /6 904 bolt up to a 318? #110170
08/26/08 03:55 PM
08/26/08 03:55 PM
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Castlegar, BC, Canada
That AMC Guy Offline
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I once had a slant 6 with a straight pipe. Never once got pulled over for being too noisy! The exhaust manifold is restriction enough.


Bloody Mary, Full of Vodka, Blessed art thou among cocktails....

Re: Will a /6 904 bolt up to a 318? [Re: 340727dart] #110171
08/26/08 04:48 PM
08/26/08 04:48 PM
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Posts: 17,846
S.E. Michigan
ZIPPY Offline
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What you should do is find a rusted or wrecked car (or truck) with a good running 318 and good trans in it, take everything, and put it in your car.

Re: Will a /6 904 bolt up to a 318? [Re: That AMC Guy] #110172
08/26/08 04:58 PM
08/26/08 04:58 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

I once had a slant 6 with a straight pipe. Never once got pulled over for being too noisy!


Me too.


live every 24 hour block of time like it's your last day on earth
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