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1979 LA 360 internals in 1996 magnum 5.9 block? #1985549
01/07/16 02:22 PM
01/07/16 02:22 PM
Joined: Jan 2010
Posts: 1,944
woodcrest, CA
magnum440d100 Offline OP
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magnum440d100  Offline OP
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woodcrest, CA
I swapping out a motor from a friends 1996 1500. It's is a magnum 5.9. It threw a rod and I am thinking about building it. I have a stock 79 crank, scat I beams, and speed pro Pistons I was going to put into the 79 block.

The 5.9 would definitely need machine work. It has 325,000 miles, but didn't smoke or anything. It threw a rod because it was ran out of oil.

Is this swap possible? I was hoping to have the block machined 30 over to fit the speed pros Pistons, and put a magnum 5.2 cam in it, carb intake, old style distributor, and drop it into my 72. Only issues I see MAY be the fuel pump. I'm not entirely opposed to an electric pump. I kinda want to keep the serpentine system, and use the existing accessories.

Just a thought.

Re: 1979 LA 360 internals in 1996 magnum 5.9 block? [Re: magnum440d100] #1985552
01/07/16 02:31 PM
01/07/16 02:31 PM
Joined: Nov 2003
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Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
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Lincoln Nebraska
You can purchase the Hughes cam extension so you can use an LA timing cover to retain the mech pump (its dirt cheap)


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Re: 1979 LA 360 internals in 1996 magnum 5.9 block? [Re: magnum440d100] #1985590
01/07/16 03:15 PM
01/07/16 03:15 PM
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Kalispell Mt.
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HotRodDave Offline
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The serpantine/electric fuel pump upgrade is great! I have pretty much convinced all my customers lately to do it and they all love it. Just get the little mr gasket pump from auto-zone.

The 318 cam up grade is small and not worth looking for one unless you just happen to have it sitting around. I have a couple and usually do it in towing or very heavy rigs.

The heads are probably cracked and the valves will be receded bad in those heads with that many miles. You can still get a VJ with the cracks but the receded seats are bad for flow and you can not press in hard seats with cracks in em so you may be looking for heads.

The crank/rods/pistons... all drop right in but you need to make sure you use the correct balancer/flywheel/flex plate to maintain the correct balance. If you do not get the rotating assy. balanced you will have damaging vibrations.

If the pistons are old 360 style you might mock it up, see how far below deck they are and have the deck milled to get em zero decked then run a fel-pro 1008 for tight quench and more compression. You will get more TQ HP and MPG as well as lower emmissions.

I see you are in california, what year rig are you planning on doing this in? The block may be a giveaway to a sharp emmisions inspector.


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Re: 1979 LA 360 internals in 1996 magnum 5.9 block? [Re: magnum440d100] #1985648
01/07/16 04:41 PM
01/07/16 04:41 PM
Joined: Jan 2010
Posts: 1,944
woodcrest, CA
magnum440d100 Offline OP
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magnum440d100  Offline OP
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woodcrest, CA
The vehicle it would be going into would be a 1972 d100, so no smog required.

I was unaware of the cracked heads still being a problem in 96. Bummer.

I haven't pulled it apart yet, so I have no idea what condition everything is in. I wasn't sure if I wanted it or not, but I may take the blown motor home. I won't be able to tear it apart for a few more weeks.

An yes yes speed pros are old style I guess. They were bought for a 79 360 I was building for my 72.

Re: 1979 LA 360 internals in 1996 magnum 5.9 block? [Re: magnum440d100] #1986282
01/08/16 02:30 PM
01/08/16 02:30 PM
Joined: Jan 2010
Posts: 1,944
woodcrest, CA
magnum440d100 Offline OP
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magnum440d100  Offline OP
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woodcrest, CA
Forgot to ask. If I use the 79 internals, can I run the 79 flywheel so I can continue to run the a833od?

Re: 1979 LA 360 internals in 1996 magnum 5.9 block? [Re: magnum440d100] #1986385
01/08/16 04:45 PM
01/08/16 04:45 PM
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dogdays Offline
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Yes you'd use the flywheel and harmonic damper that went with the rotating assembly.

As for compression, I'd suggest using the Mag heads if at all possible as they are lightyears ahead of an old 360 head.

There is another thing about compression: Somewhere between the two engines you have, Chrysler changed the specification for deck height. Where it used to be 9.599 - 9.600, in the later years it became 9.577 to 9.578. My '86 318 was that shorter deck, and I'm sure all the Mag blocks use that as specification.

The Mr Gasket 1121G is the thinnest head gasket I've found.

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