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Re: 340 vs 360 class racing #470717 09/18/09 10:19 AM 09/18/09 10:19 AM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	If you go stock and I mean stock there is not even a race A stock 340 out powers a factory stock 360 period a factory 360 NOT CRATE had 8.5 at best comp I have two 360s and 2 340s and I know for a fact which ones are stronger . I realize that you are talking about a full on build. but in the Factory stock form NO

Re: 340 vs 360 class racing [Re: moeflo] #470718 09/18/09 12:18 PM 09/18/09 12:18 PM
Joined: Feb 2007 Posts: 2,578 sweden 1 1Fast340 master
1Fast340 master 1 Joined: Feb 2007 Posts: 2,578 sweden	Quote: The only reason to use a shorter stroke motor is, you already have one, or you need the most HP per CI. Other than that, build with plenty of stroke and your valve train will thank you. yep thats one of the good reasons, another one is if you can make more power than your existing chassi can handle with a stock stroke then there isnt realy a good point in making more power and especialy more torque down low (that may actualy be a good reason to work on getting the car capable of handling more power instead of trying to limit torque at lower rpm but sometimes its a way of trying to make something work that isnt suposed to work)

Re: 340 vs 360 class racing [Re: Paul_Fancsali] #470719 09/18/09 12:41 PM 09/18/09 12:41 PM
Joined: Sep 2003 Posts: 378 So. Cal. E ElefuntMan enthusiast
ElefuntMan enthusiast E Joined: Sep 2003 Posts: 378 So. Cal.	Focus on class racing. There are few here that do it or have tried it, a "full on build" is not about class racing. Class racing is about blueprinting. Making what you have as close to perfect as possible and then getting it to work. From my experience both are great engines, I have set NHRA records with both. I would build the car you like, not build an engine combo for a spacific class, then get a car you may not be happy with, if you have the luxury to pick and choose. Do build a car that will be competitive in it's class, if there are lots of dominant cars in the class you WILL need to out perform them, so build one with potential. Any way you go, a 340 or 360 in just about any combo is a good way to go class racing, as for the small blocks high compression 340's have been my favorite, a wide variety of cool car bodies, carburator and HP combo's and great parts availability.

Re: 340 vs 360 class racing [Re: Locomotion] #470720 09/18/09 02:39 PM 09/18/09 02:39 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Quote: There are a lot of variables within 340's as well as 360's in Stock and SS, so it boils down to "it depends". '71 high compression 340's with a TQ tend fit and run in slightly faster classes than the other 340's and 360's. The '74 360 is right behind it, but they are used in heavier cars. Then it appears that the AVS 340's and later 360's run is several of the slower classes after that. Car weights vary quite a bit. In Stock, this tends to be spread out from D/Stock up through K/Stock or around there. Basically mid-10's through high 11's. Moparts member Elephuntman had the C/SA record with a 340 Six Pack Challenger T/A in the 10.30 range at one time!!! There is no substitute for cubic inches, so, all else being equal, a 360 will be faster. It would be intersting to do some research and see what the average '71 340 would run against the average '74 360 at the same weight. I'm sure somebody more familiar with the class weights and ET's would know already I kindof agree here but I would like to see the factory low comp 340 VS 360 4bbl comparison, oh yeah we do have them and with the same cams heads carbs manifolds... actually a very close comparison and the 360 made more HP and more TQ from the factory. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: 340 vs 360 class racing [Re: HotRodDave] #470721 09/18/09 02:49 PM 09/18/09 02:49 PM
A Anonymous Unregistered
Anonymous Unregistered A	I had a good Duster bracket car ( good enough Mccandless bought it) with the exact same heads , cam , intake, rockers, carb--I mean the very same parts--not some "like" them--back to back test swapped 340 shortblock for 360 shortblock--both zero deck flat tops with same weight stock rods etc The 360 was at least a tenth quicker in the 1/8--Car was a 6.90 car--Even after the 360 got some laps etc it was always a tenth quicker at every track I went to--Stroke is the deal-- and even that little bit made a diff -- CR was the same except for the tad extra from the stroke on the 360--

Re: 340 vs 360 class racing [Re: mrart01] #470722 09/18/09 03:02 PM 09/18/09 03:02 PM
Joined: Jul 2008 Posts: 609 Boise M Moparteacher mopar
Moparteacher mopar M Joined: Jul 2008 Posts: 609 Boise	IMHO the advantage would go to the 360, but that's for Stock Eliminator class racing. IHRA crate or NHRA Super Stock may favor the 340. My primary reasoning for the 360 envolves the piston to valve clearance issues that are inherantly more complicated with higher compression and/or smaller displacement engines. The 360's tend to be lower compression engines thus putting the piston lower in the bore. Piston placement can have a direct effect on the cam profile for NHRA stock class. Stock class requires stock valve lift, but no limits on duration or LSA. The lower piston would allow a longer duration and tighter LSA to be utilized before piston-to-valve clearance would become an issue. Disclaimer: I don't build small blocks for class racing. So I may be completely wrong. I have built a big block 383 for stock and can tell you the high compression 383 has serious limitations on cam choice without sacrificing compression ratio. Your question would be a good one for Classracer.com

Re: 340 vs 360 class racing [Re: mrart01] #470723 09/18/09 03:20 PM 09/18/09 03:20 PM
Joined: Jul 2008 Posts: 609 Boise M Moparteacher mopar
Moparteacher mopar M Joined: Jul 2008 Posts: 609 Boise	One more thing. The maximum (legal) overbore for stock is .075" which means a .065-.070" oversized piston would be used. Overbore both engines max (.075") and the 360 will gain more displacement because of the longer stroke. A third thing, the longer stroke of the 360 means a lower rod-to-stroke ratio results in a piston that moves towards and away from TDC at a faster rate. This fact will only aide the piston-to-valve clearance in loooooong duration cams.

Re: 340 vs 360 class racing [Re: Moparteacher] #470724 09/18/09 04:01 PM 09/18/09 04:01 PM
Joined: Aug 2003 Posts: 4,979 new jersey usa 1 11secdart master
11secdart master 1 Joined: Aug 2003 Posts: 4,979 new jersey usa	Like I said I`ve ran quickest with a 360 but I did go 11.35 with my 9 1/2 to 1, 557 lift cam, ported J head, stock stroke 340 and it made around 450 hp on the dyno. 5490599-GregVanEssPhotography-IslandDragway6-27-09-_DSC5929-16.mht (73 downloads) Last edited by 11secdart; 09/18/09 04:02 PM. 68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV

Re: 340 vs 360 class racing [Re: ElefuntMan] #470725 09/18/09 04:33 PM 09/18/09 04:33 PM
Joined: Oct 2003 Posts: 7,141 my own world theraif master
theraif master Joined: Oct 2003 Posts: 7,141 my own world	Quote: Focus on class racing. There are few here that do it or have tried it, a "full on build" is not about class racing. Class racing is about blueprinting. Making what you have as close to perfect as possible and then getting it to work. From my experience both are great engines, I have set NHRA records with both. I would build the car you like, not build an engine combo for a spacific class, then get a car you may not be happy with, if you have the luxury to pick and choose. Do build a car that will be competitive in it's class, if there are lots of dominant cars in the class you WILL need to out perform them, so build one with potential. Any way you go, a 340 or 360 in just about any combo is a good way to go class racing, as for the small blocks high compression 340's have been my favorite, a wide variety of cool car bodies, carburator and HP combo's and great parts availability. Thats why i wanted to build my 73 wagon to run R/S its a cool car and not many in the class lol

Re: 340 vs 360 class racing [Re: mrart01] #470726 09/18/09 05:40 PM 09/18/09 05:40 PM
Joined: Jan 2006 Posts: 168 Indianapolis Indiana J Jamie340 member
Jamie340 member J Joined: Jan 2006 Posts: 168 Indianapolis Indiana	I run stock and have qualified at the US Nationals. This comparison, using the term class is easy to answer, using the term build is a different story. The 1971 340 is rated 314hp, the 1974 360 is rated 300hp, the 1972 340 289hp. I believe that is the case. It is also reflective on the track Now to the term build, who knows it is no longer apples to apples. Jamie

Re: 340 vs 360 class racing #470727 09/19/09 01:31 AM 09/19/09 01:31 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	Quote: Oh ya'..all depends on who builds it.. Doesnt matter who builds it. Build a 340 and a 360 identically, run them in the exact same car, same setup, and the 360 WILL win. 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: 340 vs 360 class racing [Re: 69L78Nova] #470728 09/19/09 05:11 AM 09/19/09 05:11 AM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Quote: Oh ya'..all depends on who builds it.. Doesnt matter who builds it. Build a 340 and a 360 identically, run them in the exact same car, same setup, and the 360 WILL win. No it won't...

Re: 340 vs 360 class racing #470729 09/19/09 07:55 AM 09/19/09 07:55 AM
Joined: Aug 2003 Posts: 1,313 Charlotte, NC L LSP pro stock
LSP pro stock L Joined: Aug 2003 Posts: 1,313 Charlotte, NC	90% of the replies on this topic are worthless. If you have zero experience with 340/360 stock or super stock motors, then you don't have a clue which may be better. Thanks to Gene and Jamie for their valid opinions. The discussion is about class motors, not bracket motors - the 360 will still have the 1.880" intake valve and just over 9-1 compression, the 340 carries the 2.020" intake valve and will have just over 11-1 compression, and both will have the TQ.

Re: 340 vs 360 class racing #470730 09/19/09 11:43 AM 09/19/09 11:43 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	Quote: No it won't... Are you out of your mind? Are you really going to start this arguement again? There is nothing special about a 340 as an engine. Cubes are cubes. The 360 WILL edge it out if both are built equally. If you dont think so, you have a lot to learn, and are just displaying a high level of ignorance...based on more than just your user name. ....And I do have experience with both 340s and 360s 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: 340 vs 360 class racing [Re: 69L78Nova] #470731 09/19/09 01:32 PM 09/19/09 01:32 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Quote: No it won't... Are you out of your mind? Are you really going to start this arguement again? There is nothing special about a 340 as an engine. Cubes are cubes. The 360 WILL edge it out if both are built equally. If you dont think so, you have a lot to learn, and are just displaying a high level of ignorance...based on more than just your user name. ....And I do have experience with both 340s and 360s Your the one starting an arguement a question was asked i gave an answer you disagree with it,your the ignorant one not me..i'll build a 340 that'll kick the snot out of any 360 you can...

Re: 340 vs 360 class racing #470732 09/19/09 01:46 PM 09/19/09 01:46 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Quote: Quote: No it won't... Are you out of your mind? Are you really going to start this arguement again? There is nothing special about a 340 as an engine. Cubes are cubes. The 360 WILL edge it out if both are built equally. If you dont think so, you have a lot to learn, and are just displaying a high level of ignorance...based on more than just your user name. ....And I do have experience with both 340s and 360s Your the one starting an arguement a question was asked i gave an answer you disagree with it,your the ignorant one not me..i'll build a 340 that'll kick the snot out of any 360 you can... problem is you gave wrong answer...the question was about 340/360 engines in stock elminator not what came from the factory or bracket raced... 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: 340 vs 360 class racing [Re: 70AARcuda] #470733 09/19/09 03:14 PM 09/19/09 03:14 PM
Joined: Feb 2004 Posts: 6,257 acworth / N. georgia - south e... cheapstreetdustr master
cheapstreetdustr master Joined: Feb 2004 Posts: 6,257 acworth / N. georgia - south e...	imho and experience. its the compression that has to be factor'd the architecture on these engines for the most part are identical.. so now you have 3.58" Stroke of the 360 to compare..which is obvious.. then you have compression or pistons in the early model 340s...that werent availible to the 360 next is carb..which by now is prolly not an issue.... stroke and the extra 20 cubes..should go to the 360..as the winner.. cheapst. 365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]

Re: 340 vs 360 class racing [Re: Jamie340] #470734 09/19/09 03:29 PM 09/19/09 03:29 PM
Joined: Aug 2006 Posts: 81 langley b.c. canada D don miller member
don miller member D Joined: Aug 2006 Posts: 81 langley b.c. canada	In nhra stock eliminator the early 340s are at a disadvantage with the avs, even if they are rubbed on they still flow less than the later model tqs, some guys such as Chuck Beach have made good power with the avs (Chuck has run these for over 30 years) but, if you are just starting out you will be hard pressed to keep up with the GM cars running in the same class.

Re: 340 vs 360 class racing #470735 09/19/09 06:53 PM 09/19/09 06:53 PM
Joined: Apr 2007 Posts: 2,327 Glendale, AZ 6 69L78Nova Banned. Forever.
69L78Nova Banned. Forever. 6 Joined: Apr 2007 Posts: 2,327 Glendale, AZ	Quote: i'll build a 340 that'll kick the snot out of any 360 you can... Yeah, not only is that immature, but its also ridiculous. Whats to stop me from saying I can build a 360 thatll beat the 340 you build? Get out of here. Keep the dopey replies coming. They are amusing BTW...My dad can beat up your dad 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: 340 vs 360 class racing [Re: 69L78Nova] #470736 09/19/09 07:02 PM 09/19/09 07:02 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Quote: i'll build a 340 that'll kick the snot out of any 360 you can... Yeah, not only is that immature, but its also ridiculous. Whats to stop me from saying I can build a 360 thatll beat the 340 you build? Get out of here. Keep the dopey replies coming. They are amusing BTW...My dad can beat up your dad Saying is one thing doing is another...trust me any 360 you get will be embarassed by a 340 of mine...I see your from Arizona time to get out of the hot sun,its affecting your judgement

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