Re: stroking whats the benifit of a 340 block vs 360?
[Re: coronet1966d]
#149510
11/11/08 10:20 PM
11/11/08 10:20 PM
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Joined: Jun 2006
Posts: 5,169 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,169
CT
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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
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: GTX MATT]
#149512
11/11/08 11:30 PM
11/11/08 11:30 PM
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Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
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I Win
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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
![](/ubbthreads/images/graemlins/popcrn.gif)
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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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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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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
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: marklock]
#149515
11/12/08 12:02 AM
11/12/08 12:02 AM
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Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
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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 ...
![](/ubbthreads/images/graemlins/Twocents.gif)
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: JohnRR]
#149516
11/12/08 12:06 AM
11/12/08 12:06 AM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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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
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: moparpollack]
#149518
11/12/08 12:09 AM
11/12/08 12:09 AM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
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Posts: 2,327
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!
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: 375inStroke]
#149525
11/12/08 11:04 AM
11/12/08 11:04 AM
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Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
I Win
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I Win
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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 .
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: JohnRR]
#149526
11/12/08 12:15 PM
11/12/08 12:15 PM
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Joined: Apr 2007
Posts: 560 MI
marklock
I tried too hard for a custom title
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I tried too hard for a custom title
Joined: Apr 2007
Posts: 560
MI
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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 ![](/ubbthreads/images/graemlins/bow.gif)
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: marklock]
#149527
11/12/08 01:16 PM
11/12/08 01:16 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
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Columbia, CT
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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.
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: 340dart4spd ]
#149529
11/12/08 02:00 PM
11/12/08 02:00 PM
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Joined: Jan 2003
Posts: 10,968 Hampton, Ga.
70dart360
Green Meister
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Green Meister
Joined: Jan 2003
Posts: 10,968
Hampton, Ga.
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Why all the talk about stroker stuff, ya dont need it to get what he wants. ![](/ubbthreads/images/graemlins/shruggy.gif) 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. ![](/ubbthreads/images/graemlins/whistling.gif)
70 Dart Swinger
72 D-100 440 shortbed
76 Pinto, 68k 21mpg!
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: 70dart360]
#149530
11/12/08 02:05 PM
11/12/08 02:05 PM
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Joined: Apr 2007
Posts: 2,826 NY usa
540challenger
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master
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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.
![](/ubbthreads/images/graemlins/iagree.gif)
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: 540challenger]
#149531
11/12/08 02:16 PM
11/12/08 02:16 PM
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Joined: Jan 2003
Posts: 9,982 Ansonia, CT
CJK440
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master
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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"
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: Dakota_Don]
#149534
11/12/08 05:10 PM
11/12/08 05:10 PM
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Joined: Jan 2003
Posts: 1,586 Tampa, FL
tpabayflyer
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,586
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
71 Challenger 528 Hemi project 09 Gr Cherokee 5.7 hemi in da house!!
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: blairboy3]
#149538
11/12/08 06:28 PM
11/12/08 06:28 PM
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Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
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A Banana Republic near you.
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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 ?
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: BrianT]
#149541
11/12/08 08:52 PM
11/12/08 08:52 PM
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Joined: Jan 2003
Posts: 465 Oconomowoc, WI.
Cudahlr
mopar
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mopar
Joined: Jan 2003
Posts: 465
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 2006 Ram 2500 sport - The Cudahlr
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: BrianT]
#149542
11/12/08 09:25 PM
11/12/08 09:25 PM
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Joined: Sep 2005
Posts: 2,179 California, USA
blairboy3
top fuel
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top fuel
Joined: Sep 2005
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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
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: AARCONV]
#149545
11/13/08 10:45 AM
11/13/08 10:45 AM
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Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
I Win
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I Win
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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 .
![](/ubbthreads/images/graemlins/Twocents.gif)
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Re: stroking whats the benifit of a 340 block vs 360?
[Re: blairboy3]
#149546
11/13/08 12:25 PM
11/13/08 12:25 PM
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Joined: Apr 2005
Posts: 15,134 Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
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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]
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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
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Joined: Sep 2004
Posts: 22,873 Chicken coop
dustergirl340
Chicken Little
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Chicken Little
Joined: Sep 2004
Posts: 22,873
Chicken coop
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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
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