M1 intake height?

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Evan Dutch

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Hey guys,

Looking at picking up an M1 intake for the 360 magnum in my 1971 Plymouth scamp. Current setup is still the stock keg intake, the hood just barely closes. Does anyone know if the keg intake is the same height as the M1?

Thanks in advance

IMG_0143.jpeg
 
Which M1? The dual plane is shorter than the keg.
 
I have the Magnum EFI M1 intake under the hood of my 70 Swinger. I'm running a 68/69 unsilenced air cleaner, and it *just* fits with a 3 inch tall filter. If I don't tighten down the wing nut enough I get a bit of rubbing on one of the hood braces. With the hat shown in your picture I think you have an extra half inch or so.

I'd love to hear about how much of a difference it makes with your setup, what with that big hair dryer feeding your engine.
 
I have the Magnum EFI M1 intake under the hood of my 70 Swinger. I'm running a 68/69 unsilenced air cleaner, and it *just* fits with a 3 inch tall filter. If I don't tighten down the wing nut enough I get a bit of rubbing on one of the hood braces. With the hat shown in your picture I think you have an extra half inch or so.

I'd love to hear about how much of a difference it makes with your setup, what with that big hair dryer feeding your engine.
Do you have the 2 barrel or the 4 barrel version? I’m trying to find one but not sure if there is a height difference between the 2bbl or the 4bbl with the 2bbl adapter
 
Do you have the 2 barrel or the 4 barrel version? I’m trying to find one but not sure if there is a height difference between the 2bbl or the 4bbl with the 2bbl adapter
I took measurements from the bottom flat of the intake where it would seal against the engine block China wall up to a straight edge sitting on the carb/throttle body flange of the intakes.

M1 single plane two barrel EFI intake is 7 3/8" and that is where the two barrel throttle body sits.

M1 Single plane four barrel intake is 5 3/4" and that is up to the four barrel flange of the intake itself, without a 2 barrel adapter.

Hughes Edelbrock dual plane EFI intake is about 5" up to the four barrel flange of the intake itself, without a 2 barrel adapter. The Hughes four barrel to EFI two barrel adapter is 2 1/8" tall. The Hughes intake with the Hughes 2 barrel adapter is 7 1/8" tall.

There is four barrel throttle bodies than can be installed on the four barrel intake from Holley and others. Then you just have to adapt the wiring to the sensors it has and mount your air hat right to the four barrel throttle body. I cannot find the four barrel throttle body right now to measure its height.

You could also possibly buy or fab a forward facing adapter and then mount a modern single blade throttle body and no air hat.

Or, use an older, although a little less efficient, single plane intake that is a little lower and then use any of the adapter setups mentioned above. This one would require welding in some fuel injector bungs to make it work.

Several of these scenarios have played out in my head but I have not run any of them yet.

Updated to add this note. Measurements I took were all to the front China wall area. Some intakes are angled or canted down in the front and that could slightly alter the comparisons for hood clearance.
 
Hey guys,

Looking at picking up an M1 intake for the 360 magnum in my 1971 Plymouth scamp. Current setup is still the stock keg intake, the hood just barely closes. Does anyone know if the keg intake is the same height as the M1?

Thanks in advance

View attachment 1716353922
I can’t imagine any of the aftermarket efi intakes being as tall as the kegger but maybe I’m wrong. While I absolutely love your setup I have to mention that the hat you’re using is pretty bad for making big power. If you’re keeping boost to street friendly pump gas levels then I’d say no big deal but if you’re trying to make more than that I recommend a different one. Carry on
 
I can’t imagine any of the aftermarket efi intakes being as tall as the kegger but maybe I’m wrong. While I absolutely love your setup I have to mention that the hat you’re using is pretty bad for making big power. If you’re keeping boost to street friendly pump gas levels then I’d say no big deal but if you’re trying to make more than that I recommend a different one. Carry on
Thank you! It’s the hat that came with the torqstorm kit. It won’t be seeing over 10psi and it’ll be 93 pump gas. I’m limited on how hard I can push it and since I can’t fit an intercooler that limits me even more. I’ve got quite a bit of safeties programmed into my tune (boost cut, timing pull at certain coolant and air temps, etc). I want to keep the car streetable so I’m not chasing huge numbers
 
I took measurements from the bottom flat of the intake where it would seal against the engine block China wall up to a straight edge sitting on the carb/throttle body flange of the intakes.

M1 single plane two barrel EFI intake is 7 3/8" and that is where the two barrel throttle body sits.

M1 Single plane four barrel intake is 5 3/4" and that is up to the four barrel flange of the intake itself, without a 2 barrel adapter.

Hughes Edelbrock dual plane EFI intake is about 5" up to the four barrel flange of the intake itself, without a 2 barrel adapter. The Hughes four barrel to EFI two barrel adapter is 2 1/8" tall. The Hughes intake with the Hughes 2 barrel adapter is 7 1/8" tall.

There is four barrel throttle bodies than can be installed on the four barrel intake from Holley and others. Then you just have to adapt the wiring to the sensors it has and mount your air hat right to the four barrel throttle body. I cannot find the four barrel throttle body right now to measure its height.

You could also possibly buy or fab a forward facing adapter and then mount a modern single blade throttle body and no air hat.

Or, use an older, although a little less efficient, single plane intake that is a little lower and then use any of the adapter setups mentioned above. This one would require welding in some fuel injector bungs to make it work.

Several of these scenarios have played out in my head but I have not run any of them yet.

Updated to add this note. Measurements I took were all to the front China wall area. Some intakes are angled or canted down in the front and that could slightly alter the comparisons for hood clearance.
Thank you for that, I missed out on a great deal for a 4bbl M1 yesterday (guy sold it before I got there unfortunately). That intake looked like a good height. But then I’d have to source the aftermarket 4bbl throttle body or the 4bbl to 2bbl adapter.

Just wish there was a more readily available magnum intake that already was setup to accept fuel injection.

The measurements you provided definitely help me though!
 
Check out this thread below. First post is what we need somebody to make. Post seven has a home made intake. I thought he had more pictures in a build thread but I don't see them right now. Then, post 32 shows a single plane with elbow and forward facing. Not sure about hood clearance but that is a fairly clean setup.

Single throttle body EFI intake
 
Check out this thread below. First post is what we need somebody to make. Post seven has a home made intake. I thought he had more pictures in a build thread but I don't see them right now. Then, post 32 shows a single plane with elbow and forward facing. Not sure about hood clearance but that is a fairly clean setup.

Single throttle body EFI intake
If I had the tooling I wonder if it would be worthwhile to take a victor intake for an LA and rework the bolt holes to line up with the magnum head pattern

IMG_0149.jpeg
 
I hope this helps.

67 Barracuda
408 Magnum based
Poly lock motor mounts(slightly taller than stock and no “give”)
M1 single plane 4 bbl
Edelbrock spread bore to sq bore adapter
Edelbrock heat insulator
Edelbrock AVS2 800

I got just over 3.25” from the carb flange to hood. With a 68 unsilenced air cleaner, and a drop base I have enough room for a 2.75” or possibly 3” tall filter.

Most relevant to you is the carb flange to hood height. How tall is that carb hat?

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IMG_9543.jpeg


IMG_9542.jpeg


IMG_9528.jpeg


image.jpg
 
I hope this helps.

67 Barracuda
408 Magnum based
Poly lock motor mounts(slightly taller than stock and no “give”)
M1 single plane 4 bbl
Edelbrock spread bore to sq bore adapter
Edelbrock heat insulator
Edelbrock AVS2 800

I got just over 3.25” from the carb flange to hood. With a 68 unsilenced air cleaner, and a drop base I have enough room for a 2.75” or possibly 3” tall filter.

Most relevant to you is the carb flange to hood height. How tall is that carb hat?

View attachment 1716354386

View attachment 1716354387

View attachment 1716354388

View attachment 1716354389

View attachment 1716354390
It’s very tight, the boost tube that comes off the carb hat makes contact with the hood when fully latched.
 
Probably the hood bracing making contact. If you are not opposed you can cut out where it touches.

I was thinking his hat would be right in the middle of the hood. My 68/69 air cleaner can touch on the edge of one of the braces, but it's obviously 13" around and much bigger than the hat.
 
I was thinking his hat would be right in the middle of the hood. My 68/69 air cleaner can touch on the edge of one of the braces, but it's obviously 13" around and much bigger than the hat.
The hat is close to hitting but the boost tube makes contact first
 
The hat is close to hitting but the boost tube makes contact first
Oh right, the intake tube!

They are all absurdly priced. Unfortunately everyone that has one seems to think it's the most amazing upgrade and they want big bucks for them.

I really don't get it, because they're not a great intake for a stock Magnum engine. Without a tune and valve springs it's kind of worse than the kegger, especially in a heavy truck. Most of the extra joy from the M1 comes in above 4000 rpm, and they really shine the higher you go (highest I have gone is 6200 - by mistake!). The stock Magnum PCM has a rev limiter of 5200, and the valve springs won't support anything above the rev limiter.
 
I was thinking his hat would be right in the middle of the hood. My 68/69 air cleaner can touch on the edge of one of the braces, but it's obviously 13" around and much bigger than the hat.
He says it’s the boost tube hitting, not the hat.
 
Oh right, the intake tube!

They are all absurdly priced. Unfortunately everyone that has one seems to think it's the most amazing upgrade and they want big bucks for them.

I really don't get it, because they're not a great intake for a stock Magnum engine. Without a tune and valve springs it's kind of worse than the kegger, especially in a heavy truck. Most of the extra joy from the M1 comes in above 4000 rpm, and they really shine the higher you go (highest I have gone is 6200 - by mistake!). The stock Magnum PCM has a rev limiter of 5200, and the valve springs won't support anything above the rev limiter.
I agree. The M1 two barrel single plane was intended for Magnum equipped vehicles going racing that wanted to keep the EFI and still mount air conditioning. The kegger usually beats everything down low when naturally aspirated.
 
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