Help Identify Early 318 Single Plane Intake

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George Jets

George Jets

1967 Dart 2 Door
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As some of you know I have been playing around with different basic 318 builds and alternative 318 factory intakes.

The latest intake is something I have had on the shelf here for a long time. For nostalgia purposes I would like some help identifying this early 318 Single Plane intake.

Have done quite a bit of looking online and it looks close to the 1965 273 2bbl intake, but those earlier year '65 had the different angle and position intake bolts compared to the 66 and up 318 intake bolt pattern.

This single plane intake I have here bolts up to this '91 stock 318 that I am working on, I am sure it will bolt up to the other 1970 and 1974 318s that I have here too.

20200620_135746.jpg


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Mounted up on 1991 stock 318, bolt holes lined up and bolts started.

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This is more of a history deal for me, and I am not interested in how well it performs or not.

My questions are looking at the casting number can someone identify what year this intake actually is and what applications were they used on.

Under the blue rattle can paint on it there looks to be that Turquoise Green factory color like they used on the 1967 383s.

Thanks for any help you can offer.
 
Casting # 3814031-3

Checked mymopar.com no intake casting number even comes close.

Our guy from Alaska is pretty good at decoding things, maybe he will take a look.
 
My books go to 74 and end with a 375xxxx numbers. It is probably late 70's manifold. It doesn't have enough ports to be a mid 80's lean burn. Could very well be a truck intake.
 
toolmanmike said:
My books go to 74 and end with a 375xxxx numbers. It is probably late 70's manifold. It doesn't have enough ports to be a mid 80's lean burn. Could very well be a truck intake.
Click to expand...

OK, good
The engine had a truck pan on it, engine block is date coded 7-6-70. The 318 had been over bored .030 ths, different cam and new frost plugs so it has been built once. Bought it as a buildable core with the intake, but the intake was not bolted on.

So was wondering if that intake came from some other year engine during it's last build.

I was thinking they started the Dual Plane intakes in '68 And 69 on the 318s and moving forward. Don't know if they still made the stock single planes after the Dual Planes came out ?? I don't know, sure someone on here knows better.

Thanks
 
Professor Fate said:
Or Marine?
Click to expand...

Found a lot of intakes for the Chrysler Marine 318 engines, all of that is really interesting. Mostly factory cast iron 4 bbl single planes.

At first look they looked like a real nice 4bbl intake the 318s, but then looked at more pictures of them and they jacked up the back of the carb mount to level out the carb cause the engine sits in there at a steep angle to be inline with turning then props on the inboards.

Same runners as my 2 bbl intake.

Chrysler 318 marine intakes:
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Crazy steep angle in that carb mount base.
Lol . .
 
That is the same manifold my 1971 318 2 barrel had when I got it, and uses the small Carter BBD. I believe it is a 1967-1972 318 manifold, but I know they also made dual planes at this time. I'm not sure if it's original to my car, and it's out at my storage place but I'll check the numbers tomorrow. Seems like there was one from a 1972 duster for sale a while back. I've seen some information before that if running in roundy racing in the 2 barrel iron intake stock lift rules classes that it's the manifold to use when using 318 heads. I often wonder if Holley used this intake as the starting pattern for the Street Dominator intake.
 
Casting # 3814031-3
Click to expand...

Ignore the dash three and the 8 is actually a 6 - so 3614031

Casting numbers are often different than the actual part number, but both are only 7 digits with no dashes.

In that number casting range, possibly from a '72?

There are a few search engine hits you can explore.
 
Garrett Ellison said:
That is the same manifold my 1971 318 2 barrel had when I got it, and uses the small Carter BBD. I believe it is a 1967-1972 318 manifold, but I know they also made dual planes at this time. I'm not sure if it's original to my car, and it's out at my storage place but I'll check the numbers tomorrow. Seems like there was one from a 1972 duster for sale a while back. I've seen some information before that if running in roundy racing in the 2 barrel iron intake stock lift rules classes that it's the manifold to use when using 318 heads. I often wonder if Holley used this intake as the starting pattern for the Street Dominator intake.
Click to expand...

Thanks, had one person here looking on Google about it saying it maybe was some sort of mopar performance racing manifold to begin with.

Interesting on the roundy round racing histoy application of it.
 
The intake runners where they exit the intake manifold are quite a bit smaller than the 69 to 74 2bbl dual planes I have worked with.

This is one thing that is making me think it is an earlier intake like '67 just before the dual planes came out.

This photo of intake ports is with 318 size intake gasket, intake ports are quite undersized.

20200620_143038.jpg


Even the 2 incoming ports at the plenum are 1 1/2" diameter. Smaller than the later 318 2 bbl manifolds that are 1 5/8" diameters up to 74 for sure on the dual planes.

So the smaller ports are making me think earlier manifold.

68 came with the 9.2:1 pistons and maybe even a little more stock cam. So maybe they opened up the intake a bit to help them breathe better with the added performance starting in '68.

Just piecing this together from observations.
 
toolmanmike said:
My books go to 74 and end with a 375xxxx numbers. It is probably late 70's manifold. It doesn't have enough ports to be a mid 80's lean burn. Could very well be a truck intake.
Click to expand...

Mike,
When was the last year of the 273 ?

Friend of mine was saying that the smaller exit ports on that single plane makes him think it came off 273. That would have to be 66 for it to be off 273, cause it bolts up to the 69-74 318s. What you think ???

Undersized ports big time:
20200620_143038.jpg
 
George Jets said:
Mike,
When was the last year of the 273 ?

Friend of mine was saying that the smaller exit ports on that single plane makes him think it came off 273. That would have to be 66 for it to be off 273, cause it bolts up to the 69-74 318s. What you think ???

Undersized ports big time:
View attachment 1715548975
Click to expand...
273/318 ports are the same. 69 was the last year for the 273.
 
Kind of looking like the general opinion out there is it is a single plane 2 bbl manifold available from 1967 to 1971.

Some have stated that it was used in racing applications also to fit certain rules standards.

Here are a few examples and opinions:

Screenshot_20200620-213654_Chrome.jpg
 
Mt grandfather's 71 318 Dart had the same intake on it from the factory.
 
The small port size and shape is the reason I think Holley started with that manifold when designing the 318 street dominator... I swapped mine for one because the engine was so happy with that intake in the mid range I didn't want to alter it too far from the original setup.
 
67 273 2bbl will bolt to any later LA. Got one right here, free to anyone local. Note port size and relieved bolt holes (?). That person who said no 2bbl single planes is wrong.

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20200620_203337.jpg
 
I' believe that's a '73 and up BBD in the picture. It wouldn't surprise me to see one on a 70's truck. I once tore down a truck 318 that came factory with the 318/360 compression killer heads and had a 360 two barell "iron anchor" intake with a Holley 2245 carburetor.
 
Just re-looking at the pictures, comparing George's and Pishta's manifolds... Pishta's, as he stated, is a '66-'69 version, George's is definitely post '70- it has the larger bypass fitting for the aluminum water pumps...
 
Professor Fate said:
Just re-looking at the pictures, comparing George's and Pishta's manifolds... Pishta's, as he stated, is a '66-'69 version, George's is definitely post '70- it has the larger bypass fitting for the aluminum water pumps...
Click to expand...

Now that is a good observation about the larger bypass fitting, post '70 for alumnium water pumps.

OK looking more and more like that is the original 2 bbl single plane for that 318 engine with the date code on the block of
7-6-70. Engine came out of a pickup with the truck oil pan on it when I got it.

Perfect. Thanks a lot !!

Lots of good knowledge here on this site.
 
They also used the single plane 2 barrel intake on the later 318's for Road Runners, better top end? I have seen them there, as well as some A bodies. Seems like no rhyme or reason on A bodies. Probably on pre smog trucks as well. Also on 66-69 273's. Nice catch on the later bypass nipple.
 
FWIW-
While doing some maint. work on my '75 Swinger today, I checked it's (original) 318, and sure enough- it has the single plane manifold on it.
Now curious, I dug out an original 318 from a '73 Dart I parted out a couple years ago from under the bench in my shop- it has the dual plane.
Both engines are basically unmolested. I'm not seeing any kind of a pattern here, if there ever was one...
 
George Jets said:
He has an exact copy to my 2 bbl single plane with a picture, on his charts.
Says: 70 - 72 318s

Thanks
Click to expand...
cool-gif.gif

Glad that looks to be a match.
I saw that as a maybe but forgot after looking at the part number to casting number list.
 
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