Re: Swapping from LA to a magnum questions.
[Re: C_stripes]
#2223089
12/30/16 12:46 AM
12/30/16 12:46 AM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
top fuel
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top fuel
Joined: May 2003
Posts: 1,751
Graham, WA
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You have the start of a great project with that 5.2 Magnum.
You will need a timing cover with provision for a mechanical fuel pump or use an electric pump mounted down by the tank since you want to use a carburetor, but you can get that off your core along with the distributor and the balance of the ignition system. Intakes are out there, but I have not researched them for part numbers as I don't have anymore LA stuff and my new daily has a 5.9 Magnum and I am happy with it as is.
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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Re: Swapping from LA to a magnum questions.
[Re: C_stripes]
#2223136
12/30/16 01:47 AM
12/30/16 01:47 AM
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Joined: Dec 2010
Posts: 1,035 Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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Crosswind makes an Edelbrock knock-off intake for a reasonable price that will work on either LA or Mag heads. You can use the LA flywheel and headers. I wouldn't waster my time with the LA exhaust manifolds which would probably leak anyway due to the AIR injection ports. Use the Mag serpentine belt/alternator/p/s pump setup. Can't run A/C with the crosswind intake anyway due to the old style thermostat housing location. You will have to trim off the A/C compressor mounting pad for clearance. However this will require an electric fuel pump mounted by the tank to supply fuel but makes for a much cleaner swap IMHO. I should also note that when using the 120 or 136 amp magnum style alternator a fused 10 ga. shunt wire should be added between the alternator and battery to prevent overload of the factory amp gauge and bulkhead wiring in your 85 truck.You will be amazed how much better the mag motor runs compared to the old tires LA.
Last edited by 71yelladustr; 12/30/16 01:48 AM.
392 gen III hemi on E-85 727 trans Dana 60 10.02@134
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Re: Swapping from LA to a magnum questions.
[Re: C_stripes]
#2223835
12/31/16 02:51 AM
12/31/16 02:51 AM
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Joined: Oct 2007
Posts: 3,897 Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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The magnum is out of a jeep? Before doing anything else, make sure the starter is in the same place as your current engine... I want to say jeep put it somewhere else...
If you ever find yourself in a fair fight, your tactics suck.
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Re: Swapping from LA to a magnum questions.
[Re: C_stripes]
#2223848
12/31/16 03:17 AM
12/31/16 03:17 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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The magnum heads flow well enough to run just over 400 crank hp. It will be much more potent than your LA. my Dakota cane with a 5.2. Just an M1 intake, headers, mild cam, and a re-tune, it was pushingvmy 4000 lb truck to mid 14s at almost 100 mph with 2.2 second 60' times.
Indy still has a few Mopar 4bbl magnum carb intakes in stock but the EFI guys are buying them up and machining them for EFI because the stock for the EFI versions has been consumed. They're about $325 shipped. It's a single plane but don't let that scare you. Everyone says single plane kills low end torque but I have no lack of off idle torque.
All you REALLY need to swap the whole thing over is a carb, intake, distributor, and electric fuel pump. You can run the accessories as non-AC with a shorter belt, but not the factory non-AC belt unless you get a non AC alternator bracket. Google will tell you the correct belt. I don't remember off the top of my head. The alternator can be hooked up to an external VR even though the magnums were controlled by the computer.
If you do any mods, you can really wake up that magnum. They respond well to cam swaps. Something around 210-220 intake duration, and with the right springs and retainers, it's a bolt on swap.
Jeeps did commonly have the starter on the passenger side, but I think that's all in the trans. I may be wrong though, so definitely check that.
**Photobucket sucks**
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Re: Swapping from LA to a magnum questions.
[Re: C_stripes]
#2228800
01/06/17 07:10 PM
01/06/17 07:10 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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for Ign. I like to by pass the stock harness and run a points dist with a pertronix points conversion. that will drop in the magnum block.
and make sure to use the magnum N balance flywheel. I scored mine at advance auto for 135$ IIRC the 5.9 was 165$
for headers I would go with the hedman 79170 which work on a 92-93 D or W series chassis with magnum/NV4500 5 speed. FYI** new style pilot bearing.
Last edited by scratchnfotraction; 01/06/17 07:14 PM.
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Re: Swapping from LA to a magnum questions.
[Re: hooziewhatsit]
#2243221
01/29/17 02:29 AM
01/29/17 02:29 AM
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Joined: Jan 2008
Posts: 2,251 ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,251
ILLINOIS
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The magnum is out of a jeep? Before doing anything else, make sure the starter is in the same place as your current engine... I want to say jeep put it somewhere else... the starter pocket is on the trans bellhousing, engine itself is the same. also for questions about the crank, the 318 Magnums used the same crank as every other 318 at least back to 1968. some were drilled for a pilot bearing, some not. There is a needle bearing you can get to go in the torque converter pilot hole so no worries if your crank isn't finish-machined for the pilot bearing.
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Re: Swapping from LA to a magnum questions.
[Re: scratchnfotraction]
#2243309
01/29/17 12:28 PM
01/29/17 12:28 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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and make sure to use the magnum N balance flywheel.
N balance? As in neutral balance? The 5.9 is still external balance on the magnum. It's just a different amount of weight as an LA 360, so you need the magnum flexplate and a neutral balance converter, or a 5.9 magnum flywheel. The 5.2 is internal balance. --for anyone playing with a 5.9...
Last edited by 70Cuda383; 01/29/17 12:28 PM.
**Photobucket sucks**
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