360 or 340?

[RustyRatRod]

Acquiring a 360 IS much cheaper and it'll rev fairly quickly. Most would have to put an electronic timer on the tach to see just how much slower it would rev vs the 340 but I bet it isn't much.

With modern lighter rotating assemblies, the 360 will fly. Even a 4" arm 360 will zing past a 340 of yesteryear.

 

[mygasser]

Acquiring a 360 IS much cheaper and it'll rev fairly quickly. Most would have to put an electronic timer on the tach to see just how much slower it would rev vs the 340 but I bet it isn't much.

i did mean max revs but yes on a street or even street/strip motor how quickly it could build revs when built 'right' would be hard to distinguish from a similarly built 340. and once they both have a 4" stroke even less so i'd imagine.
neil.

 

[RPM 440]

Hence the thousands of 360s,318s stroked or not with the 340 stripes and badges. Will always wish you had an original real deal.

 

[crackedback]

Speak for yourself.

340's were the performance package, so they get the love from the yesteryear lovers. 360's never had the benefits a 340 had. There are many with 408/416 striping on cars as well.

Your car, your build.

Another in the category of dissing others approach, even though the 360 may just show taillights to that vaunted 340... carry on.

 

[RPM 440]

Thanks for the insight. I feel better about ordering that $200 Rolex I have had my eye on

 

[crackedback]

Thanks for the insight. I feel better about ordering that $200 Rolex I have had my eye on

I have a real one, 340 car. Cool piece, it's not all that.

You're welcome. You got a Bro-lex. Carry on with the snide. LMAO

 

[RustyRatRod]

Hence the thousands of 360s,318s stroked or not with the 340 stripes and badges. Will always wish you had an original real deal.

I do. A slant 6.

 

[Cranky]

I do. A slant 6.

One guy just messaged me and asked if I thought it was a real hemi RR. Or not. I told him I figured it was a factory screw up, for sure. Yea, I know it was a real hemi RR.

I would also bet real 340 Dusters came factory with dual exhaust.

Years ago I built a 318 Duster out of a slant car, before it was popular. I built it for me. Got the car from a friend in town that bought it new. I should have just keep; it original. I was bored. I also welded in the bracket for the dual exhaust, just for me, no one was trying to fool people back, then, the "clone: was not even invented quite yet. Heck back them few people even lusted for a real 340 A body. Too many big block whatever cars around, even the 67-9 BB A body was not that hard to find...cheap enough.

In 70 I found a 69 340 Dart for sale but we wouldn't go with me to put it up on a lift so I could look underneath real good. It was a nice looking car but that killed the deal for me.

 

[fishmens67]

The "truck motor" mentality.

It wasn't a good truck motor, kind of a pig. lol
The only thing that saved my 360 powered 73 W200 from being an absolute pig from the factory is the 4.10 gear it came with.

 

[Cranky]

It wasn't a good truck motor, kind of a pig. lol
The only thing that saved my 360 powered 73 W200 from being an absolute pig from the factory is the 4.10 gear it came with.

Did it have a 2 bbl carb on it? Had a 79 D300 Adventurer SE Club Cab long bed with a 360, aluminum intake, small DP Holley and headers. It too had a 4.10's with a granny low 4 speed....but, I had 33" tires on it to help kill that 4.10 some. It was NO slouch and it would pull anything my present 97 Club Cab lwb diesel truck will pull. Only difference is that the 79 truck would pull down 8 mpg loaded or not and the diesel will do 17 pulling 4k lbs at 65. Kinda wish I had kept that 79 and dropped in a diesel!

 

[fishmens67]

Did it have a 2 bbl carb on it?

Yep from the factory.

 

[marksmopars]

One thing I would consider is a later 360 with the roller tappers, flat tapped cam issues are a limitation that a later 360 or even a stroked 318 can avoid while making enough power to have fun. Just saying, I do love my 340’s.

 

[Cranky]

Yep from the factory.

IIRC, only the 'hipo' 360's came with a 4bbl carb. Kinda like the 383 when it was smothered with a 2bbl. They were dogs. Just adding a 4bbl made a noticeable difference then add a decent intake and better exhaust, they woke up. Even the E58 engines woke up to better exhaust if one didn't make any other changes.

 

[DartGT55]

I love my 360

 

[fishmens67]

IIRC, only the 'hipo' 360's came with a 4bbl carb. Kinda like the 383 when it was smothered with a 2bbl. They were dogs. Just adding a 4bbl made a noticeable difference then add a decent intake and better exhaust, they woke up. Even the E58 engines woke up to better exhaust if one didn't make any other changes.

I put a performer intake with Holley 600 and a small Summit cam and reworked the ignition, made it more respectable.
Does pretty good pulling, the 4.10 gear helps on the grades.

 

[Cranky]

I love my 360

View attachment 1716466530

View attachment 1716466532

Nice!!!!

 

[DartGT55]

Nice!!!!

It’s got a 750 Holley and a nice size cam in it the cam is a crane 459/480 I like the new air cleaner red one

 

[DionR]

I'm pretty sure that's incorrect. I have/had both.

Three sets of 68-71 I've had are basically identical but IIRC the left has a different casting number for 71.
72-73 340s had a similar manifold shape on both right and left hand, but the outlets are 2" instead of 2 1/4" and they have bosses for the choke stove/shield.
74-up 360/318 use the same manifolds as far as I'm aware which are the same basic manifolds the 318s always had (meaning no seperate runners for the RH side nad smaller/shorter runners on the LH side and again, with the choke stove/shield stuff on them.

This is wrong.

The '72+ 340/360 exhaust manifold for the DS was the same as the earlier ones but with the addition of the flange for the heat shield. It has the large flat flange and uses the same head pipe gasket as the earlier ones. And the manifold didn't get smaller to accommodate the flange.

The tip off is the flat flange. The 318 DS manifold uses a cone for all years.

On the PS, the '72+ manifold is a different casting for the 340/360, but it is still a log style with a small outlet and a cone. No idea if there is actually any performance advantage between a 340/360 PS manifold and a 318.

The DS and PS have never had the same basic shape for an A-Body. Maybe an E/B-Body, but the A-Body DS sweeps up for steering box clearance while the PS sweeps down.

Here is a set with a 12/73 casting date.

The '75-76 A-Bodies with the E-58 motor are a gray area for me. I am convinced that at least in '75 they still got dual exhaust, not sure on the '76. So I would bet the above manifolds were used on the '75, and maybe even the '76 A-Bodies that got the E-58 360 HP.

 

[DionR]

360 power just died down quickly and in no way felt anything like the same animal. So the proof is in the driver seat. Not on paper or what the guy on the next stool tells ya.

Are you sure you were running an E-58 360? Those got the same cam as all the automatic 340's, so it is hard to imagine that they would "died down quickly" in comparison. There was a non-performance 360 4bbl option, but it got the 2bbl cam. Maybe that is what you are remembering?

Not saying one was faster than the other, just pointing out that if they both had the same cam seems like they would run similar, or at least close to the same.

 

[DionR]

72-73 340s had a similar manifold shape on both right and left hand, but the outlets are 2" instead of 2 1/4" and they have bosses for the choke stove/shield.

The more I think about this, I think this guy is thinking of B/E-Body manifolds, not A-Body.

Here is a '73-4 C/B/E-Body 340/360 DS manifold, that does indeed have a similar shape to the PS manifold.

 

[Illahe]

360...longer stroke more torque..with TODAY'S parts ..cheaper and faster.

Can rev to 7K if build right...

Are you getting 7k out of your 360 with internal or external balance, and OEM or aftermarket steel crankshaft. I have one in the mixer for a spare engine and I'd like to see 7k reliably.

 

[Illahe]

I have a 67 Dart that I am thinking of swapping motors out. If I were to find a 340 would that be a better choice than the 360?

Which do you guys recommend?

Common sense tells me the 360, but I don't know...I'm new to Mopar.

Thanks everyone!

-Mark

340's are still around. I paid 400 for the last short lock with a fresh .030" overbore and steel crank with oem rods which both needed machining. Swap meets are where you'll find the best deal.

In comparison, 340/360 My et's are similar. Both mild flat top short blocks, but the 340 runs a 106lsa SFT with 1.88 heads. 340 hits 6k right now and the 360, on 110lsa takes a minute to gain upper rpm. Both cams are in the 240@.05 range.

 

[DionR]

To further flesh out the E-56 (single exhaust 4bbl) and E-58 (dual exhaust and high flow cam 4bbl) differences:

https://www.hamtramck-historical.co...ataBook/1975/75-Plymouth-engineering_0006.jpg

Maybe @RPM 440 was running around in Cali "back then"?

1975 numbers

 

[Ant]

340's are still around. I paid 400 for the last short lock with a fresh .030" overbore and steel crank with oem rods which both needed machining. Swap meets are where you'll find the best deal.

Ok, I'll believe it when I see it.
Still around? Yes.

400 dollars.

 

[273]

To me there ain't a huge difference between 318/360/340 since they can use 99% of the same parts, put the same crank into them, 3.31 = 318, 333, 340, 3.58 = 344, 360, 367 4.00 = 384, 402, 410.