Re: Which intake is better flowing?
[Re: 71yelladustr]
#1274461
07/28/12 11:56 AM
07/28/12 11:56 AM
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Joined: Jan 2003
Posts: 27,471
So Cal
autoxcuda
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Posts: 27,471
So Cal
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Quote:
.... Now the M-1 single plane is a different story, When I bumped the compression and added more cam along with some head work it trumped the ole LD340 
Seems like he has a single plane M1 on there now.
Curious to why the move to dual plane. Engine specs?
Also curious about the results.
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Re: Which intake is better flowing?
[Re: 71yelladustr]
#1274462
07/28/12 07:51 PM
07/28/12 07:51 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
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Florida
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Quote:
FWIW, I had both intake manifolds on my 73 340 Dart sport and the LD340 ran the best. This was on a 10 to 1 engine with a .484 purple shaft otherwise bone stock. It picked up .25 sec in the 1/4 and a couple MPH. The M-1 is basically a aluminum version of an early 340 manifold. Now the M-1 single plane is a different story, When I bumped the compression and added more cam along with some head work it trumped the ole LD340
 with what he said.
The M-1 dual plane would work best on a mild, street only small block. I compared a Weiand Stealth, which appears very similar to an LD-340, to a Holley Strip Dominator (very similar to the single plane M-1) on my race-only combo and the Weiand dual plane was only about a tenth slower than the single plane Holley. But I have a lot of gear, converter and cam duration, which stays over 5,000 rpm once the converter flashes, and the single plane liked it better. I figure for anything less, the LD-340 should be better overall. Of course, carb tuning will be different and will be a factor in the final results.
See if the LD-340 will like 2 jet #'s leaner on the shallow plenum side or 2 #'s richer on the deeper plenum side. Jet for MPH and squirters and pump cams for 60'-330' times.
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Re: Which intake is better flowing?
[Re: autoxcuda]
#1274463
07/29/12 12:10 PM
07/29/12 12:10 PM
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Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
bigblock340power
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Elk Grove, Calif.
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Quote:
Quote:
.... Now the M-1 single plane is a different story, When I bumped the compression and added more cam along with some head work it trumped the ole LD340
Seems like he has a single plane M1 on there now.
Curious to why the move to dual plane. Engine specs?
Also curious about the results.
Going back to the duel plane for better streetability. Think I'm going with a vac. secondary 750 holley too. Just making it a cruser. Already changed out my torque converter to a more streetable setting, and my rear gear is now 3.23's down from the 3.91's. Looks like I might be building my stock motor again, and putting it back in (sometime in the near future). That's all.
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Re: Which intake is better flowing?
[Re: imfixinmopars426]
#1274467
07/29/12 05:07 PM
07/29/12 05:07 PM
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Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
bigblock340power
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Elk Grove, Calif.
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Quote:
forget either,and get a eddy rpm air gap,best intake i have ever used.
Thank you for you opinion, I'm sure it's a very nice intake but as I said in the begining of this post: "Don't want to hear about what is better out there, just these two (LD340 & M-1 duel plane)". Period!
Again, thank you.
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Re: Which intake is better flowing?
[Re: MoparforLife]
#1274469
07/30/12 07:03 PM
07/30/12 07:03 PM
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Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
bigblock340power
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Quote:
Maybe this will tell you something: Back a few years ago I was in the process of ordering a new Airgap form a prominent engine builder on the east coast. He asked me what I was running at the time and I was told to save my money, that andy improvement (if any) would be minor and not a cost efficient thing.
Not satisfied I called edlebrock tech and the technician I got was familiar with the old school LD340 and he told me the same thing. IMO it speaks well for old school technology.
Wow! I was going to go with the M-1. But now, I might just use the LD340. I kind of like the look better on the LD too. Besides it's all blasted and ready for paint. I guess it would be cool to open the hood and see an LD340 under there. Don't see to many of them now-a-days. Ok, I'm going LD!
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Re: Which intake is better flowing?
[Re: bigblock340power]
#1274470
07/30/12 07:20 PM
07/30/12 07:20 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
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Posts: 25,200
Upper Midwest
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I have one on my street 360 in the Coronet and ran one in the drag Duster for several years till I sold the car. It ran consistant 11.40's with a best of 11.349 with a 360.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: Which intake is better flowing?
[Re: can.al]
#1274472
08/02/12 12:57 PM
08/02/12 12:57 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
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Florida
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Quote:
..how did you compare them to each other?
If that question was directed to me.......I swapped the intakes at the track and had time to try some different jetting and accellerator pump changes. I just don't recall if it was all in one, long test-&-tune day or also included the next day which provided time trials and a race. Weather was taken into consideration, but conditions were similar.
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Re: Which intake is better flowing?
[Re: bigblock340power]
#1274473
08/02/12 02:33 PM
08/02/12 02:33 PM
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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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Quote:
Quote:
Maybe this will tell you something: Back a few years ago I was in the process of ordering a new Airgap form a prominent engine builder on the east coast. He asked me what I was running at the time and I was told to save my money, that andy improvement (if any) would be minor and not a cost efficient thing. Not satisfied I called edlebrock tech and the technician I got was familiar with the old school LD340 and he told me the same thing. IMO it speaks well for old school technology.
Wow! I was going to go with the M-1. But now, I might just use the LD340. I kind of like the look better on the LD too. Besides it's all blasted and ready for paint. I guess it would be cool to open the hood and see an LD340 under there. Don't see to many of them now-a-days. Ok, I'm going LD!
I run a LD4B(318 small port) and the LD340, I wont get rid of mine anytime soon.
I tried the airgap but went back to the LD340,I gained nothing with the airgap. did not lose anything but saved $ as I borrowed the airgap for a T&T run down. glad Don gave me that same advice when I was looking to buy an airgap 
when I was growing up the LD340 is all I ever heard about on the SB 340, even hear it still today.
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