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gen1dak
Dodge Dakota
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1/22/2004
21:18:39
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 Subject: RE: 360 Magnum Crate Motor
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Steven. Sorry man. A standard (LA) intake will not bolt to Magnum heads unless the heads are drilled. Hughes Engines does this. The Magnum intake bolts straight vertically, and the LA bolts into the heads at an angle. You have a couple options. First off, which crate engine do you have? Is it the 380hp? I'm guessing it probably is. Don't choke your engine with a 650-anything. You ought to slap a new Edelbrock Thunder series AVS on there (it's been getting lots of good reviews). Best of both worlds for torque and 800 cfm (shades of Thermoquad) for HP. Edelbrock has recently announced the new Performer RPM AirGap intake for Magnum, available shortly. This intake is a dual plane that also gives the best of both worlds, with more torque all over the rpm scale, and equal, sometimes better hp than the single planes through 6500 rpm. Not exactly resto-perfect, but Edelbrock made the original 340 intake for Mopar, so it'd still be in the family. For a 6-pak, you'd have to have the heads drilled in the LA style. In a dyno test of pre-Magnum small block intakes, the Air Gap beat the 6-pack by a good 15hp, and made more torque. But then, nothing beats a 6-pak for sheer cool factor. Typically, 360/380hp owners wind up putting a milder cam in as well. That particular cam is really pretty racey as delivered from MP. When tested, the 360/380hp actually turned in 409hp. I'd at least try the Edelbrock intake and carb before doing a cam swap. If you happen to have the 300hp 360, the same advice applies. One other option. Get some LA 360 heads and have them thoroughly reworked. Use late model pre-Magnum hollow pushrods and rockers. The LA heads will bolt on, then you can use the 6-pack intake. It's VITAL that you use the late model LA pushrods and rockers since they oiled in this fashion, just like the Magnums. It's a little out there, but it is do-able, and it's a bolt-on operation.
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Steven
Dodge Dakota
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1/22/2004
22:54:33
|  RE: 360 Magnum Crate Motor
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Cool. You just saved me some bucks and a lot of heartache. The mechanic I have working on my car is currently fixing a bad axle bearing. I will tell him to stay the hell away from my motor. I thought it was wierd that everywhere I read that a 750 was recommended for this motor and he was telling me otherwise. I think he is thinking along the lines of the old 360's not this monster crate (it is the 380 HP). He seems to be quite confident that he will not be able to tune this car correctly (timing is way off) with out making the swap. Sounds like I need a new mechanic. These guys are hard to find. I will not make the 6-pack swap. That's a lot of money and work to just look cool. It's already cool, it's a 'Cuda!. I'll slap a 4 barrel (6 pack look alike) oval air cleaner assembly on that Holley (like the Road runners use to come with) and call it a day. It's a street car AAR clone! No need to go to all that trouble. Thanks man!
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gen1dak
Dodge Dakota
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1/23/2004
00:45:50
| RE: 360 Magnum Crate Motor
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Any time man. Hey, do you realize just how hot that engine is? It pushes 3400lb Dusters into the high 12's in the quarter mile...right out of the crate! ....with 3.90 rear, 3-speed tranny. For you to have torque issues, I'm thinking the current carb isn't set up correctly. The 409hp dyno test I'm referring to showed the same engine making 380 ft/lb at 2500 rpm. Even against stiffer hwy gears, it should still pull pretty well. This continued, and peaked with 439 ft/lb at 4100 rpm. HP peaked with 409 at 5400 rpm. They used the Mighty Demon 750 carb (78 primary/87 secondary jets) and the engine had the single plane M1. Sometimes a carb spacer will help, but this was tested and neither the open or 4-hole one inch made any difference on that setup. When set properly, you should have around 850 rpm idle. They ran 34 degrees ignition timing. With the cam the 360/380hp uses, vacuum is only 6-7in. The dual plane will kick this up a point or two. I prefer the AFB/AVS-style carbs. That thing would run like a castrated pony with a 650. Now with a milder cam, you'd have terrific throttle response with a 650, but as-is, it needs at least a 750. Keep in mind vacuum secondaries work better for street driving. Keep the rubber side down......
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ryan
Dodge Dakota
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3/02/2004
20:40:40
| RE: 360 Magnum Crate Motor
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Does anyone know where i can get a torque converter for my 89 4x4 truck?
727 no-lockup 3 speed
360/300 magnum crate motor
Thanks
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Swamp Goat
Dodge Dakota
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3/03/2004
04:40:39
|  Good news, no BB to SB for the 300!
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Thanks for all your helpful posts guys. It didn't take many posts to convince me that this was a pretty dumb idea, again you're all right and thanks for the posts.
With the help of a friend the 440 motor in question has steadily been showing signs of life after adjusting the timing and carb. I had to install an electric fuel pump when the mechanical fuel pump wasn't bringing in enough gas last year. since then I don't think the carb. & air/fuel mixtures have been right.
I'll be sure to post some pictures for you guys when I finally get it right.
P.s. If anyone has any performance economical performance tips to add I'd be greatly appreciative - for instance, what would be a good intake and ignition combo for my motor? I don't want to go too crazy but would like just a little more umph...any suggestions?
It seems to idle fine with great throttle response in neutral, but she stalls if I give it too much gas while driving.
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hey ryan
Dodge Dakota
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3/05/2004
23:54:54
| RE: 360 Magnum Crate Motor
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www.jegs.com
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john fritz
Dodge Dakota
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10/01/2005
20:07:37
| RE: 360 Magnum Crate Motor
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I recently purcashed a 71 demon 6 cyl. and am wondering the best way to go crate or rebuilt 340 or 360 Also im wonderig if anyone owns the 360 320hp motor and how well s performs.thanks
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gen1dak
Dodge Dakota
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10/02/2005
02:32:42
| RE: 360 Magnum Crate Motor
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Crate engines make for quick completion of the task, but it can be a lot of cash to plunk down at one time, so that's pretty much it. Building your own allows for bargain hunting, and spending as the budget allows. Either way, you end up with a hot smallblock. 320HP should make for a mid-13's in the quarter. Also, 340's are pricey due to their rarity. Hot Rod did an article a while back called "Junkyard Jewel" which covered a 318 buildup. It made great power all the way to 400HP at 6,000 rpm's. It was done for $2,000. You could do the same with a $200 junkyard 360. Remember, the 360 can be taken out to 408 cubes. Do all the work yourself, and get a stroker 408 for less than a new crate 360. It's all in what you want to do.
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John Fritz
Dodge Dakota
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10/03/2005
19:42:57
| RE: 360 Magnum Crate Motor
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Thanks for the reply Im thinking I might go with the 320hp crate its more in my budget. thanks
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Matthew Vader
Dodge Dakota
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12/26/2005
00:37:20
| 72 Challenger
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I recently acquired a 72 Challenger with no engine or tranny. I want to use the car as a daily driver and dont need massive amounts of power just a good solid engine and tranny pref. standard with an overdrive. any suggestions would be appriciated. Thankyou.
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gen1dak
Dodge Dakota
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12/29/2005
03:16:44
| RE: 360 Magnum Crate Motor
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Best bet for an overdrive stick tranny:
http://www.keislerauto.com/mopar/e-body.html
The base Magnum crate engine, now rated at 320HP, would be a very nice deal for your car. To low-buck the engine, you could look around for a 5.2 Magnum (318 cubes) put a 4V carburetor intake manifold and 4V carb on, add Mopar Performance electronic ignition package and you'd have a solid 250HP engine. A pre-Magnum 318 can be had for a song and will respond to a few mods with little expense, and you will again have a solid 250HP engine without trying.
Of note is the fact that Magnum engines have water pumps and fans that run counter-clockwise. Pre-Mags (referred to as LA engines) turn clockwise, so they cannot be swapped. You can, however, swap out the entire accessory drive setup (water pump, engine fan, power steering, crank pulley) and use an LA V-belt setup on the Magnum.
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