Swapping 273(or 318) to a 340/360 in Mopar A-body - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-16-2004, 08:32 PM
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Swapping 273(or 318) to a 340/360 in Mopar A-body

I would like to get as much info as possible on swapping SB Mopar engines in mid-sixties Mopar A-body ( actually most interested in Dodge Dart and Plymouth Valiant, but I'm open to suggestions =)).

I live in Scandinavia and most of the old darts/valiants here have either the 273 or 318 with the 904.

What problems might i run into if i aim for a 340 or a 360.

As i have understood the 340:is are quite rear/expensive (that's the situation up here anyhow) but make an easy swap?

The 360 however seems to be quite easier to find (cheaper too) but the swap will be more difficult beause of:
*Some engine mounts need to be replaced?
*Oil pan problem?
*The engine is externally balanced (What modifications will this fact in particular need me to make?)

Which swap would be most time/cost-effective? I'm planning on making it a street/strip car, around 400hp+100 shot.

I am not sure at all of the "info" i have stated above. I have picked up the info in posts here and there (in this board mostly). If iIm am wrong in any way, i am sorry. Please correct me on all such points.

Some extras =):

*How much work will I have to put down for the 273 > 360 swap in comparison to a slant six > 360 swap? In percentage or something =)

*Any links to Dart/Valiant forums would be appreciated.

Thanks in advance.

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Old 09-17-2004, 07:04 AM
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The 273>360 swap is a bolt in. The 904 transmission is on the light side unless it's prepped for racing so try to find a 727 tranny. The slant 6> to V8 swap requires a different K member plus a few other things to swap out. I would stick to the V8 to V8 swap. The rearend on a 273/318 A-body will probably be too weak, very few came with 8 3/4 rear ends.
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Old 09-17-2004, 09:38 AM
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Quote:
Originally posted by engineczar
The 273>360 swap is a bolt in. The 904 transmission is on the light side unless it's prepped for racing so try to find a 727 tranny. The slant 6> to V8 swap requires a different K member plus a few other things to swap out. I would stick to the V8 to V8 swap. The rearend on a 273/318 A-body will probably be too weak, very few came with 8 3/4 rear ends.
Hi, thanks for answering

Are you sure that these two facts are incorrect:

* The 360 is externally balanced (which the 273 isnt?) so i have to find a 360 torque converter or i will get trouble in the future.

* A motor mount on the driver side(quite sure, might have been the other side) will have to be modifed/changed in order to install the 360. Also i have read small notes about oil pans/sumps needs to be changed.

Thanks again.

Edit: Both the 3:rd and 4:rd kit (counted from above) indicate that this is not a simple bolt-on-procedure(?):
http://www.engine-swaps.com/frames/f...372Amount.html

Last edited by Gilligan; 09-17-2004 at 09:58 AM.
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Old 09-17-2004, 10:33 AM
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The torque converter has it's own balance and is segregated by transmission type, 727 or 904. One for an early 340 or a 360 would be the same.

Sorry, the drivers side mount is different. I still look at it as a bolt in though when compared to some swaps.

The oil pans shouldn't be an issue, they did have rear sump and mid sump just match up whats coming out with what's going in, if the 340/360 is out of an A body then it's even easier. The truck pans were different as well.
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Old 09-17-2004, 05:27 PM
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Quote:
Originally posted by engineczar
The torque converter has it's own balance and is segregated by transmission type, 727 or 904. One for an early 340 or a 360 would be the same.
Im sorry for my english but i don't really understand what you mean in the qouted part.

What exactky do you mean with that its segregated by transmission type? What exacty will it mean if i, for example, have a 904 in the car.

"One for an early 340 or a 360 would be the same" = I will encounter the same problem with the 340?

Again, sorry for my bad english.
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Old 09-18-2004, 08:26 AM
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the 904 and 727 tranny's use different converters

for the converters it does not matter if the motor is externally or internally balanced.
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Old 09-18-2004, 10:42 AM
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Quote:
Originally posted by engineczar
the 904 and 727 tranny's use different converters

for the converters it does not matter if the motor is externally or internally balanced.
Could anyone link me to a site that explains this a little bit further.

This is how i have understood it from your post:

The 360 came with the 727 in almost all models, right?

The torque converter from the 727 is the only one fitting the engine, because of the fact that the 360 is externally balanced and the 727 torque converter has the little weights on it stock?

So If i want to put the 360 in a car that has previously had e 273/318 and has the 904 tranny, i will have to etiher get one of those B&M flexplates or change to a 727 tranny?

However if the car has had a 273/318 with a 727 previously then that 727 could not have the same converter as the 360-727 combo converter, since the 273/318 is not internally balanced? This 727 must have been modified?

Ok, how much of all this crap i wrote was wrong, and much have i actually understanded right?

Thx again for putting out with me.
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