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stroking whats the benifit of a 340 block vs 360? #149509
11/11/08 10:17 PM
11/11/08 10:17 PM
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Clinton Twp. Michigan
coronet1966d Offline OP
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other than the added few cubes, whats the advantage? i found a 1973 340 short block for $150 and that needs to be gone through and i already have a mid 80's 360 thats machined and ready to go what should i do? im aiming for 450hp streetable aluminum heads ect ect

Re: stroking whats the benifit of a 340 block vs 360? [Re: coronet1966d] #149510
11/11/08 10:20 PM
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I thin at 450 horses with aluminum heads it wont make much difference, the 340 should hold up for sure not so sure about the 360 but I would think 450 horse wouldnt be a problem. 150 for a 340 is pretty cheap though. With machining costs as long as the durability of the 360 isnt in question Id use that, the difference is going to be what, 8 cubes or so? Not enough to really make a difference IMO.


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: stroking whats the benifit of a 340 block vs 360? [Re: GTX MATT] #149511
11/11/08 10:53 PM
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Bore size is bigger on the 340 and bearing bore is larger on the 360

Buy the 340, flip it for more money and use that cash to do the 360... If you are on a budget.

Re: stroking whats the benifit of a 340 block vs 360? [Re: GTX MATT] #149512
11/11/08 11:30 PM
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Quote:

I thin at 450 horses with aluminum heads it wont make much difference, the 340 should hold up for sure not so sure about the 360 but I would think 450 horse wouldnt be a problem. 150 for a 340 is pretty cheap though. With machining costs as long as the durability of the 360 isnt in question Id use that, the difference is going to be what, 8 cubes or so? Not enough to really make a difference IMO.




what's the durability issue on a 360


Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149513
11/11/08 11:47 PM
11/11/08 11:47 PM
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56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
Re: stroking whats the benifit of a 340 block vs 360? [Re: moparpollack] #149514
11/11/08 11:56 PM
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I like the smaller mains on the 340, less load on the bearings at high rpm. My

Re: stroking whats the benifit of a 340 block vs 360? [Re: marklock] #149515
11/12/08 12:02 AM
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Quote:

I like the smaller mains on the 340, less load on the bearings at high rpm. My




????

more bearing will handle a larger load , less FRICTION with the smaller bearing .

I'm still waiting for the DURABILITY issue ...


Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149516
11/12/08 12:06 AM
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Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149517
11/12/08 12:07 AM
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Clinton Twp. Michigan
coronet1966d Offline OP
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i was under the impression that 340's had thicker webbing in the main bearing area

Re: stroking whats the benifit of a 340 block vs 360? [Re: moparpollack] #149518
11/12/08 12:09 AM
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Glendale, AZ
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Yeah, no kidding. I ran 7800rpm in my race car for 6 years on a stock cast crank 360 with H-beam rods and hypereutectic pistons. Finally took it apart after all that time, and it looked brand new. My vote is for the 360. There is nothing magical about a 340, or the block itself. 8 cubes is 8 cubes!


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Re: stroking whats the benifit of a 340 block vs 360? [Re: 69L78Nova] #149519
11/12/08 12:18 AM
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Maple Ridge, BC, Canada
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I don't think the 340 webbing is any thicker (Except for a TA block). The main cap bolts are spaced further apart on a 360 because of the larger bearing. I would think thay are about the same strength. The 8 cubes won't make any difference.
Even if you decide to build the 360, you should still get that 340 for $150. Flip it and put the money toward the build.

Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149520
11/12/08 01:06 AM
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Quote:

Quote:

I thin at 450 horses with aluminum heads it wont make much difference, the 340 should hold up for sure not so sure about the 360 but I would think 450 horse wouldnt be a problem. 150 for a 340 is pretty cheap though. With machining costs as long as the durability of the 360 isnt in question Id use that, the difference is going to be what, 8 cubes or so? Not enough to really make a difference IMO.




what's the durability issue on a 360






Oh there was none in my opinion, i was saying I wasnt sure if the 360s are known to be reliable to 450 hp or not, not that I wasnt sure Id trust it to 450. Basically I was saying that as long as there isnt a durability issue then thats what Id use.


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: stroking whats the benifit of a 340 block vs 360? [Re: GTX MATT] #149521
11/12/08 02:28 AM
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Lots of 500-600hp 360 based strokers running around.

450hp is a piece of cake for a SB mopar block.

Re: stroking whats the benifit of a 340 block vs 360? [Re: RobX4406] #149522
11/12/08 02:40 AM
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GTX MATT Offline
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Quote:

Lots of 500-600hp 360 based strokers running around.

450hp is a piece of cake for a SB mopar block.




Well thats enough proof right there


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: stroking whats the benifit of a 340 block vs 360? [Re: GTX MATT] #149523
11/12/08 04:28 AM
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Spokane Washington
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You'll find the durability limits of either block with much over 500HP, most people build what they have or have parts for, 340 blocks usually cost/are worth more and are harder to find so it's pretty much a toss up for you since you already own both, in your shoes I'd shop for stroker parts and see which ones you come up with for the lowest cost for whichever engine.

Personally I like the 340's for nothing more than name only, either is a great base for a street strip 400-500HP stroker build.

Re: stroking whats the benifit of a 340 block vs 360? [Re: ScottSmith_Harms] #149524
11/12/08 10:58 AM
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Seattle, WA
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When the 360 was introduced, didn't they use the same casting for both motors, thus leaving the 360 with thicker cylinders, or am I smoking something?

Re: stroking whats the benifit of a 340 block vs 360? [Re: 375inStroke] #149525
11/12/08 11:04 AM
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Quote:

When the 360 was introduced, didn't they use the same casting for both motors, thus leaving the 360 with thicker cylinders, or am I smoking something?




No , you are correct , if building a smallblock stroker that's a good base .

Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149526
11/12/08 12:15 PM
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Quote:

Quote:

I like the smaller mains on the 340, less load on the bearings at high rpm. My




????

more bearing will handle a larger load , less FRICTION with the smaller bearing .

I stand corrected





Re: stroking whats the benifit of a 340 block vs 360? [Re: marklock] #149527
11/12/08 01:16 PM
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There is very little difference. For 450hp, either one is fine. I second the "buy it, sell it, invest the proceeds" idea. A 408 with a mild hydraulic cam is 450hp. And "mild" in terms of a camshaft in a 4" stroke engine starts at 245°@.050. The 340 has less vlave shrouding, the 360 piston rocks less and can get closer to the head safely in a max effort build. IMO, the mains dont mean squat. In fact, the piston rock and shrouding don't mean a heck of a lot until you max things out anyway.


Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: stroking whats the benifit of a 340 block vs 360? [Re: moper] #149528
11/12/08 01:47 PM
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reminds of several articles where I read about 340 pistons in a 360,that was before stroekr kits,, I belive mopar engine manual touches on the subject....

Re: stroking whats the benifit of a 340 block vs 360? [Re: 340dart4spd ] #149529
11/12/08 02:00 PM
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Hampton, Ga.
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Why all the talk about stroker stuff, ya dont need it to get what he wants. I'd go with the pre machined 360 and flip the 340 block if it was me. It is worth way more than your paying for it.

On second thought, I do have a brand new set of forged pistons for a .040 over 360/410.


70 Dart Swinger 72 D-100 440 shortbed 76 Pinto, 68k 21mpg!
Re: stroking whats the benifit of a 340 block vs 360? [Re: 70dart360] #149530
11/12/08 02:05 PM
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NY usa
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Quote:

Why all the talk about stroker stuff, ya dont need it to get what he wants. I'd go with the pre machined 360 and flip the 340 block if it was me. It is worth way more than your paying for it.

On second thought, I do have a brand new set of forged pistons for a .040 over 360/410.





Re: stroking whats the benifit of a 340 block vs 360? [Re: 540challenger] #149531
11/12/08 02:16 PM
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Ansonia, CT
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The stroker will be more streetable.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: stroking whats the benifit of a 340 block vs 360? [Re: 540challenger] #149532
11/12/08 02:19 PM
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Eagle, Idaho
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I started out with a late 340 block and then found a 360 for $50.00. I sold the 340 for what I paid for it and then sold the parts on the 360 I wasn't going to use and came out ahead.

360's are easy to find and cheap. I'd prefer to see the 340 left as a 340 for someone who needs it for a restoration.

BTW I would take a mild 450 hp stroker smallblock over a 450 hp 340 or 360, especially on the street. You can run less gear, cam, and convertor with a larger engine and still go just as quick. The bottom end power of a 4" crank smallblock is a real eye opener.

Re: stroking whats the benifit of a 340 block vs 360? [Re: coronet1966d] #149533
11/12/08 02:52 PM
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Alton, IL
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I had my 72 360 bored to .040 over for a 4.04 inch bore w/ portd heads and a comp XE274H cam and a rpm airgap headers and 770 carb...

I would use the 360 you have then flip the 340 $$$$

Re: stroking whats the benifit of a 340 block vs 360? [Re: Dakota_Don] #149534
11/12/08 05:10 PM
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Tampa, FL
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Sell both blocks and pick up a "free" 318 block that everybody just gives away and use that for your build.....
4" crank gives you 390 cubes and good heads should get you 450HP no problem. Cast crank and lite pistons/rods make it easy to internally balance with no mallory. I used ported EQ magnum heads on my 390 and I figure it should be right at 450HP... TBF

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Re: stroking whats the benifit of a 340 block vs 360? [Re: Dakota_Don] #149535
11/12/08 05:27 PM
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Lincoln Nebraska
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Quote:

I would use the 360 you have then flip the 340 $$$$


20 more cubes & a nice chunk of change to help you finance it.


live every 24 hour block of time like it's your last day on earth
Re: stroking whats the benifit of a 340 block vs 360? [Re: 70dart360] #149536
11/12/08 05:51 PM
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California, USA
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Quote:

Why all the talk about stroker stuff, ya dont need it to get what he wants. I'd go with the pre machined 360 and flip the 340 block if it was me. It is worth way more than your paying for it.

On second thought, I do have a brand new set of forged pistons for a .040 over 360/410.




I wish this post had come up before I took a 30 over machined 340 block to scrap last month. Got $40 bucks for it.


1968 Plymouth Fury III 4-Door: 12.79 @ 115, 60'- 1.93 (Hey... it's a Cruise ship... what do you expect?!) Famoso Raceway, 02/08
Re: stroking whats the benifit of a 340 block vs 360? [Re: blairboy3] #149537
11/12/08 06:10 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

I wish this post had come up before I took a 30 over machined 340 block to scrap last month. Got $40 bucks for it.


I'm afraid to ask & TBF I have an extra 318 on a stand & a set of ready magnum heads & there's a 4" 318/340 crank for $325 in the want ads.... I should have cut up my credit card last month when I promised myself that I would


live every 24 hour block of time like it's your last day on earth
Re: stroking whats the benifit of a 340 block vs 360? [Re: blairboy3] #149538
11/12/08 06:28 PM
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Quote:

Quote:

Why all the talk about stroker stuff, ya dont need it to get what he wants. I'd go with the pre machined 360 and flip the 340 block if it was me. It is worth way more than your paying for it.

On second thought, I do have a brand new set of forged pistons for a .040 over 360/410.




I wish this post had come up before I took a 30 over machined 340 block to scrap last month. Got $40 bucks for it.




what made you think it was scrap in the first place ?

Re: stroking whats the benifit of a 340 block vs 360? [Re: coronet1966d] #149539
11/12/08 06:39 PM
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The 360 is already machined so that's the logical choice.

but I still love 340's.

Re: stroking whats the benifit of a 340 block vs 360? [Re: JohnRR] #149540
11/12/08 07:04 PM
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Lees Summit, MO
BrianT Offline
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Quote:


what made you think it was scrap in the first place ?




I agree. Should have been worth more than $40 unless there was something seriously wrong with it.

I have a running 340 (bore unknown) in my dart now, and a 360 shortblock (standard bore) that I bought for $100. My plans are to sell the running 340 to help offset the cost of building a 408.


1970 Duster 340 clone
Re: stroking whats the benifit of a 340 block vs 360? [Re: BrianT] #149541
11/12/08 08:52 PM
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Oconomowoc, WI.
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I have a 360 with a stock crank and rods everything balanced and proper clearances and edelbrock heads it will run 11.30 all day long and made 421 rwhp and has seen 7000+ rpms many times and I have never had a single durability issue with it and I built the short block 10 years ago!


1968 Barracuda 360/727 11.20 @ 121 mph 421 rwhp
1985 Harley Sportster Bobber
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Re: stroking whats the benifit of a 340 block vs 360? [Re: BrianT] #149542
11/12/08 09:25 PM
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California, USA
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Quote:

Quote:


what made you think it was scrap in the first place ?




I agree. Should have been worth more than $40 unless there was something seriously wrong with it.

I have a running 340 (bore unknown) in my dart now, and a 360 shortblock (standard bore) that I bought for $100. My plans are to sell the running 340 to help offset the cost of building a 408.




Couldn't get rid of it. I offered it to a couple guys here for $200 + shipping, offered it for just shipping, then tried giving it away locally.... nobody wanted it. Soooo, I took it & a cracked 383 block to the local scrap place. It was decked & line bored. The cylinders were bored .030 over, but had some rust. So, they would have needed to be cleaned up to probably .040.


1968 Plymouth Fury III 4-Door: 12.79 @ 115, 60'- 1.93 (Hey... it's a Cruise ship... what do you expect?!) Famoso Raceway, 02/08
Re: stroking whats the benifit of a 340 block vs 360? [Re: blairboy3] #149543
11/12/08 09:47 PM
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NEW JERSEY
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the reason I'm sticking with the 340 is that i have 2much invested in the converter...360 takes a different kind...and don't forget the crank balancer also...

Re: stroking whats the benifit of a 340 block vs 360? [Re: AARCONV] #149544
11/12/08 09:54 PM
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las vegas
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Quote:

the reason I'm sticking with the 340 is that i have 2much invested in the converter...360 takes a different kind...and don't forget the crank balancer also...




the converters are the same as long as the transmission is the same...you might need a new flexplate with the 360..

but if you are stroking the motor...then it all depends on whether you are using a forged or cast crank on either the 340 or 360...or if you are internally or externally balancing the motor..


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: stroking whats the benifit of a 340 block vs 360? [Re: AARCONV] #149545
11/13/08 10:45 AM
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Quote:

the reason I'm sticking with the 340 is that i have 2much invested in the converter...360 takes a different kind...and don't forget the crank balancer also...




Buy a B+M weighted flexplate , problem solved ... or INTERNAL BALNCE IT ??? Your convertor is NOT an issue .


Re: stroking whats the benifit of a 340 block vs 360? [Re: blairboy3] #149546
11/13/08 12:25 PM
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Kelowna, B.C. Canada
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Quote:

Quote:

Quote:


what made you think it was scrap in the first place ?




I agree. Should have been worth more than $40 unless there was something seriously wrong with it.

I have a running 340 (bore unknown) in my dart now, and a 360 shortblock (standard bore) that I bought for $100. My plans are to sell the running 340 to help offset the cost of building a 408.




Couldn't get rid of it. I offered it to a couple guys here for $200 + shipping, offered it for just shipping, then tried giving it away locally.... nobody wanted it. Soooo, I took it & a cracked 383 block to the local scrap place. It was decked & line bored. The cylinders were bored .030 over, but had some rust. So, they would have needed to be cleaned up to probably .040.




Figures. I offered a guy $500.00 for a 340 core here and didn't get it.

Dave


1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]
Re: stroking whats the benifit of a 340 block vs 360? [Re: coronet1966d] #149547
11/13/08 01:49 PM
11/13/08 01:49 PM
Joined: Sep 2004
Posts: 22,873
Chicken coop
dustergirl340 Offline
Chicken Little
dustergirl340  Offline
Chicken Little

Joined: Sep 2004
Posts: 22,873
Chicken coop
340's aren't really that hard to find around here. Just a couple years ago I found my running '68 340 with X heads on Ebay, complete from oil pan to intake for $500.

Then again, just last week we bought a complete '88 360 with 727 trans for $99 off Ebay. Even has a carb, distributor, air cleaner, mini starter, power steering pump, clutch fan, and all the brackets. Maybe we're just lucky. lol

Re: stroking whats the benifit of a 340 block vs 360? [Re: dustergirl340] #149548
11/13/08 04:09 PM
11/13/08 04:09 PM
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
Quote:

Maybe we're just lucky. lol


yes you are


live every 24 hour block of time like it's your last day on earth
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