stroking whats the benifit of a 340 block vs 360? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer stroking whats the benifit of a 340 block vs 360?

Print Thread

Page 1 of 2

1

2

stroking whats the benifit of a 340 block vs 360? #149509 11/11/08 10:17 PM 11/11/08 10:17 PM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	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 11/11/08 10:20 PM
Joined: Jun 2006 Posts: 5,169 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,169 CT	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 11/11/08 10:53 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	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 11/11/08 11:30 PM
Joined: Jan 2003 Posts: 75,125 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,125 A Banana Republic near you.	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
Joined: Nov 2005 Posts: 15,119 85086 moparpollack Lil Herman
moparpollack Lil Herman Joined: Nov 2005 Posts: 15,119 85086	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 11/11/08 11:56 PM
Joined: Apr 2007 Posts: 560 MI M marklock I tried too hard for a custom title
marklock I tried too hard for a custom title M Joined: Apr 2007 Posts: 560 MI	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 11/12/08 12:02 AM
Joined: Jan 2003 Posts: 75,125 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,125 A Banana Republic near you.	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 11/12/08 12:06 AM
Joined: Nov 2005 Posts: 15,119 85086 moparpollack Lil Herman
moparpollack Lil Herman Joined: Nov 2005 Posts: 15,119 85086	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: JohnRR] #149517 11/12/08 12:07 AM 11/12/08 12:07 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	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 11/12/08 12:09 AM
Joined: Apr 2007 Posts: 2,327 Glendale, AZ 6 69L78Nova Banned. Forever.
69L78Nova Banned. Forever. 6 Joined: Apr 2007 Posts: 2,327 Glendale, AZ	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)

Re: stroking whats the benifit of a 340 block vs 360? [Re: 69L78Nova] #149519 11/12/08 12:18 AM 11/12/08 12:18 AM
Joined: Jan 2003 Posts: 2,679 Maple Ridge, BC, Canada B Barnabas_Kriss master
Barnabas_Kriss master B Joined: Jan 2003 Posts: 2,679 Maple Ridge, BC, Canada	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 11/12/08 01:06 AM
Joined: Jun 2006 Posts: 5,169 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,169 CT	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 11/12/08 02:28 AM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	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 11/12/08 02:40 AM
Joined: Jun 2006 Posts: 5,169 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,169 CT	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 11/12/08 04:28 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	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 11/12/08 10:58 AM
Joined: Mar 2005 Posts: 1,547 Seattle, WA 3 375inStroke Special needs person
375inStroke Special needs person 3 Joined: Mar 2005 Posts: 1,547 Seattle, WA	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 11/12/08 11:04 AM
Joined: Jan 2003 Posts: 75,125 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,125 A Banana Republic near you.	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 11/12/08 12:15 PM
Joined: Apr 2007 Posts: 560 MI M marklock I tried too hard for a custom title
marklock I tried too hard for a custom title M Joined: Apr 2007 Posts: 560 MI	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 11/12/08 01:16 PM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	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 11/12/08 01:47 PM
Joined: Jan 2004 Posts: 5,476 3 340dart4spd Parts Problem
340dart4spd Parts Problem 3 Joined: Jan 2004 Posts: 5,476	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....

Page 1 of 2

1

2

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1