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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
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Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,144
Arkansas
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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.
Your life is not my fault.
My life is none of your business.
Speech is free only if you agree with those in control.
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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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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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unfortunately no it wont.
live every 24 hour block of time like it's your last day on earth
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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
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Joined: Sep 2005
Posts: 12,481
Chino Valley
RodStRace
I Live Here
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I Live Here
Joined: Sep 2005
Posts: 12,481
Chino Valley
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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? 
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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
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Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,144
Arkansas
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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.
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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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Joined: Jan 2006
Posts: 3,535
Canuckville
68Cbarge
master
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master
Joined: Jan 2006
Posts: 3,535
Canuckville
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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.htmBetween 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!
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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
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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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 
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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
Unregistered
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Anonymous
Unregistered
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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.
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Re: Will a /6 904 bolt up to a 318?
#110168
08/26/08 02:59 PM
08/26/08 02:59 PM
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Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,144
Arkansas
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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.
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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
Unregistered
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Anonymous
Unregistered
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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. 
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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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Joined: Feb 2003
Posts: 4,798
Castlegar, BC, Canada
That AMC Guy
master
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master
Joined: Feb 2003
Posts: 4,798
Castlegar, BC, Canada
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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....
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