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Marc
Dodge Dakota
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10/07/2002
12:58:45
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 Subject: 340 Magnum? is it possible?
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Message:
Ok here is what i want to do, take a good(pre 73) forged crank 340 and put magnum(ported of course)heads and intake on it so that i can use the fuel injection, i am planning on putting this in my 99 dakota 2wd. ok my main concearns are will the magnum heads fit on the older block? if not will the magnum intake fit on the old heads, and then there is the crank position sensor? is it on the timing cover, if so will the new cover fit on the old block, and what trigers it a magnetic point in the crank? or the timing set?
any info appreciated
thanks marc
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alex
Dodge Dakota
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10/07/2002
13:34:32
|  RE: 340 Magnum? is it possible?
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This truck has the motor you are describing:
http://www.inccn.net/matt.htm
Call Jon Davis at 1-765-348-4386 and he can build it for you.
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moparjoe20
Dodge Dakota
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10/07/2002
21:45:24
| RE: 340 Magnum? is it possible?
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It would be easier to swap in a 360 - you would have more torque , more cubes , and much cheaper. 340's are great engines - in a light car - it will be a pig in a 4000# truck unless you build it into a stroker and then it will still be cheaper to use a 360 Magnum block.
Using the 340 block you will run into problems with - motor mounts , crank sensor , oil pan , retrofitting a hyd roller , trying to find a block that hasn't been beat to death , etc. The only advantage is a .040" larger bore than a 360 and it has smaller main bearings.
Forged cranks are available for 360's through MP and are in the $500-$700 range depending on who you get it through.
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carter
Dodge Dakota
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10/08/2002
14:55:38
| RE: 340 Magnum? is it possible?
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Message:
all you have to do is use a 360 magnum block and then use the 340 crankshaft and 340 pistons and rods. A forty over 360 block is a stock 340 cylinder bore. then you won't have to worry with all that stuff bolting up.
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moparjoe20
Dodge Dakota
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10/08/2002
17:32:53
| RE: 340 Magnum? is it possible?
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Only problem with putting a 340 crank in a 360 block is that it won't fit , the main bearings on a 360 are larger than the ones on a 340.
Putting a 360 crank in a 340 is pretty popular though , you can cut down the mains and bore it .060" to 4.100" and come out with 378" maybe more if you offset grind the rod journals , use chevy 6" rods and have pistons made with a chevy wrist pin size - could probably get almost 390" out of it then.
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cudashoe
DakotaEnthusiast
10/08/2002
19:36:01
| RE: 340 Magnum? is it possible?
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The motor mounts are no different.
2000 4.7 5- speed, 1989 Shelby #799 White
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moparjoe20
Dodge Dakota
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10/09/2002
16:41:03
| RE: 340 Magnum? is it possible?
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340's and any small block late 80's and older does not have the bosses cast into the side of the block for the chevy style side mounts that chrysler has been using for the past few years. The magnum engines still have the ears on the front of the block like the older LA engines , you can swap a magnum into an older car but not the other way around.
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cudashoe
DakotaEnthusiast
10/10/2002
10:15:25
| RE: 340 Magnum? is it possible?
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I stand corrected - Thanks
2000 4.7 5- speed, 1989 Shelby #799 White
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brianman
Dodge Dakota
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11/23/2002
21:31:25
| RE: 340 Magnum? is it possible?
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dont the magnum heads are oiled differently. the old small blocks are oiled from the second and fourth cam journals. early magnums might have had them, the new ones dont. to drill them is almost out of the question. the pushrod angles might not line up if using a magnum roller. if one isnt used then the whole engine front will have to be changed. just go with one or the other.
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slow2dak
Dodge Dakota
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11/24/2002
12:58:16
|  RE: 340 Magnum? is it possible?
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Message:
you can use a 340 block. the motor mounts are a small issue but can be overcome with some nifty ideas. you can put the 92 and later Magnum heads on an early "A" block. one way to go is to use the roller cam conversion from Crane, stock pushrods from a Magnum motor, and any set of roller rockers you want. ive built a combo like the one you want and its not that hard. but the non Magnum intakes will not fit the Magnum heads. You can use any production Magnum intake or go with an M1 since it has the bosses for the fuel injection. any ?? just email me and let me know.
mike
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DakotaDan
*GenIII*
11/24/2002
13:11:48
| RE: 340 Magnum? is it possible?
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Message:
http://www.dodgedakota.net/cgi-bin/amb/lookup.pl?user=litlpunisher
Dan
Next Time You Think You're Perfect
~~~~~Try Walking On Water~~~~~
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dogliftsleg
Dodge Dakota
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11/24/2002
14:02:24
| RE: 340 Magnum? is it possible?
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and tells moparjoe "you need to look into the 01 version of the mpoar performance catalog. Within are listed 340 cranks that fit the 360 block and 360 cranks that fit the 340 block. This from your local mopar dealer." #P5007253 is a 360 stroke crank with 318/340 journals. you can even buy an unmachined forged crank that has enough on it so you can make it any journal/crank offset you want.
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litlpunisher
GenIII
11/25/2002
09:04:13
| RE: 340 Magnum? is it possible?
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340 crank is different than a 360. different size journals. 360 also externally balanced. changing to a 340 is not an easy swap but I would run it before a 360 anyday.
98 Dakota
Bottle fed 340ci
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big head boy
Dodge Dakota
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11/27/2002
23:11:13
| RE: 340 Magnum? is it possible?
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Message:
"whats his name" is right about the oiling situation. you might be able to overcome that by creating two seperate oil feed lines to the valvetrain by drilling into the main oil feed line and running tubing to the rockers through the valvecovers and then make indiviual squirters from tubing to each rocker arm. but that sounds like a whole lot of work.
then youd have to decide on how much pressure and volume to send up there and what size relief valve to use and how you would package all that up.still more work.
then youd have to make positive locating devices to use the magnum cam. to keep the pushrods in alignment and to keep the lifters on their rollers.because factory 340 blocks never used roller lifters.still more work.
then you have the issue of your crank sensor and trigger wheel. im pretty certain that the newer cranks use a different bolt pattern than the 340's.so youd hafta come up with a trigger wheel specially modified to use on a 340 crank. then try and get lucky dialing it in by hand.
still more work.
then youd have to get creative with placing the motor in the frame, because the 340 block has mounting points totally different than the magnums. maybe try using elephant ears. youll definitely get that hot rod feel then. but thats a lot of work.
lets say we did all these things. now, how are you going to mount all of your accessories again?you know the altenator, a/c compressor/ powersteering pump. they all work in conjunction with the new "beer barrel" manifold in how they
locate various said items. youll either have to buy a new system or scour the junkyards and run old-style muliple belts.work, work, work
what kind of manifold will you use now? if you buy one set up for carbs then youll hafta get your injector ports added and phenagle a throttle body onto it. not to mention re-aligning your bolt holes to a perpindicular position to fit the magnum heads. thats gonna cost ya.
but if youre a tough little monkey with a big fat wallet... its do-able!
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litlpunisher
GenIII
12/02/2002
08:44:20
| RE: 340 Magnum? is it possible?
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Message:
magnum oil through the pushrod so keep the 340 the same. There is 2 wats to do it: get retrofit roller cam from crane and you can oil through pushrod. Or you can use a purple shaft mechanical with a amc lifter and still oil through the pushrod.
98 Dakota
Bottle fed 340ci
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