1967 340

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The hard fact is, if the first letter is truly an M , it is a 71-73 Mound Road engine.If so, the vin# will be on the passenger side of the block by the motor mount.
 
Apparently 67' blocks have been seen with Feb casting dates so this March block could be possible. This thread is from 2014.

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Would you want a 73 340 or a 67 340.. duh
regardless of which year it is, the engine of all those years are really good engines.
The 71' is still a forged crank,(and 72' for part of the year, all if a four speed engine) The compression drops, yes. Bu they are still really well built. With the gas made today, I rebuilt my 71' with the 9.5:1, and it is a dream to run. I would be happy to have any one of them.
 
Agreed..but a 67' block just would be a cool find. Once I get my own eyes on it I will get dirty and go for the casting date.
The engine still has the exhaust manifolds on it so I will run those #'s to see what they are.
 
Agreed..but a 67' block just would be a cool find. Once I get my own eyes on it I will get dirty and go for the casting date.
The engine still has the exhaust manifolds on it so I will run those #'s to see what they are.
I hope it is, you know now where to look to fill in the gaps in Information. Just because it has an M doesn't mean they didn't build the first one there, and then moved to Windsor. it was a new design, and things were moving quickly. Mopar wanted to gang up on Ford and chevy with that engine. and they did.
it was a mystery motor to the gm and ford guys, and they were ticked when that little dart kicked ***. I also saw more than a few Roadrunner guys get their butts kicked by it as well. it was a terror on the street. I remember well!
 
i love FABO for all the cool "old guys" and technical talent that is on this site!! did any of you guys notice that the 340 jack6GTS posted on this thread had a production date of "6-20-67 and brian6pac's 340 that he just posted has a production date of "6-21-67" !! is that crazy?!! two guys here on FABO discussing production dates of old 340's "just happen" to have motors built 1 day apart!! you can't make this stuff up... !!
 
I have a 69' cuda with a build date of 1 August,68. the first day for the barracuda. The original engine was stolen in 1976. When I bought it the car came with a correct 383 from a 68 383 GTS. The build date was dated July 20th, just 10 days before the next model year. Freaky!
 
Had a stock bore 1967 340 block, sold it 8 yes ago. I like the '70-'71 blocks myself, you guys can have those wary ones.
 
i love FABO for all the cool "old guys" and technical talent that is on this site!! did any of you guys notice that the 340 jack6GTS posted on this thread had a production date of "6-20-67 and brian6pac's 340 that he just posted has a production date of "6-21-67" !! is that crazy?!! two guys here on FABO discussing production dates of old 340's "just happen" to have motors built 1 day apart!! you can't make this stuff up... !!
 
I just picked one up 2 weeks ago. Outside is a little rough but the previous owner closed it up so the inside is clean.

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I had him look 3 different times to look for the date code stamped in the block but he couldn't see it. He was getting frustrated so that didn't push it. He is a Chevy guy that took the Barracuda on trade so I really didn't want to let him know what he has if you know what I mean.
The date is cast not stamped ie 7-11-67 and that would obviously be for a '68 Dart or Barracuda because 340's started out in the '68 model year.
 
The date is stamped in the front of the block under the left cyl head. My engine was DW340P25170504. The D is for 68, W for Windsor plant, 340, P for premium fuel, 2517 date code, 0504 for 504 unit built that day. Also had a number on the bell of engine and trans, I believe was the order # not a vin. there was a upside down number on the left side of the 67 block that no others had.

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Julian date 2517.jpg


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Blocks could have been cast a month or so prior to machining, assembly and installation in the 68 models.
 
The date is stamped in the front of the block under the left cyl head. My engine was DW340P25170504. The D is for 68, W for Windsor plant, 340, P for premium fuel, 2517 date code, 0504 for 504 unit built that day. Also had a number on the bell of engine and trans, I believe was the order # not a vin. there was a upside down number on the left side of the 67 block that no others had.

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The date code is more likely 251 day of 1967, and that would be Sep 8 1967. Makes more sense.

Maybe Barry can chime in on that.
 
Would you want a 73 340 or a 67 340.. duh

If you're gonna run a stroker crank and aftermarket heads, it doesn't matter which year 340 block you use - they are all equally good.

Even if you keep it stock stroke, the 73's cast crank is good for 500 hp.

Only reason I'd be concerned about the year is if I were restoring a stocker and wanted a correctly dated block.
 
The original 340 in my 68 GTS has a 6-21-67 date. I acquired another complete 340 with a 6-20-67 date for $80.00 complete with a 70 aluminum bellhousing and flywheel.
 
Does it have the number on the left side of the block where it is a series of numbers, then a "dash" then the three digit displacement? ie. 273,318,340,360...?
 
There was a 67 dated 340 block for sale here on fabo about 5 months or so ago! I tried to buy a block on craigslist around 7 years ago in KY. The guy said it was 67 dated 340! But he backed out. So the story is the first ones were cast in 67 for use in upcoming 68 models.
makes sense...
 
i don't think it is worth arguing about the exact "date" of a 340. there is NO debate that the 340 was first offered by Plymouth for their A bodies in the 1968 model year. however, as we all know, the "model year date" and the "calendar date" are different. for at least that last 75 years, "new cars" have been released to dealers for sale around the first of September of each year. as such, a "brand new" 1968 340 Formula S Barracuda would have been unloaded off the Dodge car carrier at the Plymouth dealer sometime in September of "1967." AND of course, the 340 motor in that car would have been produced during the summer of 1967 so it could be sent to the assembly line to be installed in the "new" 1968 model year Barracudas. so there will be any number of 340 blocks and motors still existing that were "produced" in the calendar year "1967" - but it is ALSO true that those motors were FIRST installed in the "1968" model cars. it is also true that there will be 340 motors that have a block casting date and a final assembly date listing a "calendar date" in 1968. the manufacturing of this motor will have started in the summer of 1967 and continued until around early summer, 1968. sometime in the summer of "1968", engine production lines would have switched over to building the "1969" engines bearing those calendar dates. i have been guilty of making this mistake myself in arguing here on this thread. i'm sorry i didn't make this distinction between the "actual date" a motor was cast and assembled and the "model year" of the car the engine was put in.
 
^^And I don't understand ANY of the controversey. It is WELL known that car makers used to release model years for sale WELL before the end of the year. It's well known that they HAD to have made component parts, especially ones such as a casting well before this date, in order to get them machined, finished and assembled into the major parts such as transmissions, engines, rear axles etc before the assy line started up

I don't even remember when new cars used to start showing up, I want to say "late fall"?
 
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