340 or 360?
#1547747
12/15/13 11:29 AM
12/15/13 11:29 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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I bought a Mirada over the summer with a cast crank '73 340 in it. It had 567 heads, TRW 4-vlave relief stock replacement pistons, cast crank, etc. Nothing spectacular. I wanted to raise the compression, better heads, etc. Then I got to thinking that if I'm going to buy new pistons, rods, heads, whatever, would it be better to sell the 340 to someone that wants to restore something and find a 360? The intent for the car is to race it for a while until I put together an overdrive conversion for it, then make it a fun street/strip car. With parts being the same, what would you think? After reading through the 360 stock crank thread, how does a 340 cast crank compare? The 340 is .030, I don't know anything about if it was sonic tested or not. Any advice? Would you run a 340 over a 360 in a Mirada? (Clearly, originality isn't a huge concern).
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: 340 or 360?
[Re: OhioMopar]
#1547751
12/15/13 01:18 PM
12/15/13 01:18 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
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Columbus, GA
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In my humble opinion the only reason to run a 340 is if it is the original engine for the car, or if you are trying to build a high RPM engine from factory parts (and then I would want a forged crank version).
Otherwise the 360 is the way to go. Plenty of 360 LA cores still around, and just as many loose 5.9 magnums in junkyards. The heavy car will also appreciate the extra torque from the longer stroke.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: 340 or 360?
[Re: Michael Ecks]
#1547752
12/15/13 01:21 PM
12/15/13 01:21 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
In my humble opinion the only reason to run a 340 is if it is the original engine for the car, or if you are trying to build a high RPM engine from factory parts (and then I would want a forged crank version).
Otherwise the 360 is the way to go. Plenty of 360 LA cores still around, and just as many loose 5.9 magnums in junkyards. The heavy car will also appreciate the extra torque from the longer stroke.
You want all the torque you can find for that car.. its not light... 360 is better for low end torque
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Re: 340 or 360?
[Re: dizuster]
#1547754
12/15/13 02:55 PM
12/15/13 02:55 PM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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Thanks guys. To answer the first question, right now I would just like to put it together and run 12.99. More for later of course. As for the cast crank 340 not being worth as much as I think... I don't expect to retire off of it. I'm not looking for a mint. Actually with a longer stroke, I would maybe think of using the 340 block for the bore advantage. But I'm thinking stock stroke, as fast as I can go without emptying my retirement account.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: 340 or 360?
[Re: dizuster]
#1547756
12/15/13 03:20 PM
12/15/13 03:20 PM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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No offense taken! I was gonna shop it around a bit and if no serious takers, it will get stroked later. I've been on the lookout for a local 360.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: 340 or 360?
[Re: RSNOMO]
#1547763
12/15/13 07:11 PM
12/15/13 07:11 PM
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Joined: Aug 2003
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OhioMopar
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Now that's hitting below the belt!
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: 340 or 360?
[Re: OhioMopar]
#1547764
12/15/13 08:23 PM
12/15/13 08:23 PM
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Joined: Jan 2003
Posts: 8,935 Holly/MI
Dean_Kuzluzski
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Just remember Hoarders don't live any longer than anyone else. Somebody needs to store the old stuff for future needs of others! W/o getting into the age old "340 vs 360" debate. Those legendary 340's that slayed on the street/strip scene were very likely in a light A-body with good gearing, conv., cfm, comp., cam. It really comes down to the whole package, what you have to start with and where your budget best lets you throw your money at. I'd rather build a stroker ($) and run a milder gearset and converter.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: 340 or 360?
[Re: Dean_Kuzluzski]
#1547765
12/16/13 12:59 AM
12/16/13 12:59 AM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
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ever read the story about the guy who sold his livestock farm to go diamond hunting? the lady that bought the livestock farm found the worlds largest diamond one day while gardening. I would have the 340 block sonic checked first and foremost before you go do anything. it might just check out better than any of the 360 you end up with. cost after that to do what you want would be the same. a stock bore 340 is 4.04" bore . 3.31" stroke (exact same as 318) stock 360 is 4.00" and crank is 3.58" the crank journals on a 360 block are different so cranks wont swap..(common knowledge) but to bore a 360 to 4.04 you have to remove material...and most likely end up with a thinner cyl wall.. Sonic check the 340 first..if its not good on the majors..then look for the 360.. but in any case i would source the best bore thickness block in the equation.. just my
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]
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Re: 340 or 360?
[Re: Dean_Kuzluzski]
#1547766
12/16/13 01:00 AM
12/16/13 01:00 AM
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Joined: May 2005
Posts: 180 merrill, wisconsin
voigtspeed
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If the engine you have is still solid throw in a boost frendly cam and turbo it! Best power for the price. The shorter stroke will help you hook the tires and when the boost comes on it will not feel like a little 340 anymore.........................
ACCELERATION SPECIALIST
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