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340 Head ID - Cant decipher casting numbers

Mopar General Discussions

  1. KVB

    KVB New Member

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    Hi E-body fans! Not my first post here, but I guess my info got deleted and I had to rejoin. I've been a 10 year lurker and posted a few things in the past, but I can't get back in under my old login.....Anyways, this site is a great bunch folks and always enjoy the stories and information.

    I'm trying to figure out my block and head numbers...just to see what they are.

    The block was fairly easy with a f.w.340.3034.0295 stamped on the front.......but the heads I can't figure out and maybe my eyes are starting to go a little??? : )

    34875???? Any ideas? And thanks in advance!!!

    Kevin

    head casting.jpg

    block stamp.jpg
     
  2. DetMatt1

    DetMatt1 Well-Known Member

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    That’s not the casting number on the head. When you see what’s indicative of a tag with the screw head on either end that’s the date code. That said that’s one funky date code, the likes I’ve not seen before. There should be another 7 digit number that should end in something like 915.
     
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  3. 340challconvert

    340challconvert Well-Known Member

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    Never saw 34875???? on a small block head before?

    Check out this information on 340 heads:
    1968-1969-(first half) 1970 model year 340s used "X" heads cast # 2531894 with 2.02"/1.60" valves (cast #2531894/part #2531902)

    (second half) 1970-1972 model year 340s used "J", "O", "U", "Z" heads cast # 3418915with 2.02"/1.60" valves (at some point & on 360s with 1.88"/1.60" valves) (cast #3418915/part #3577053)

    340+6 T/A heads are "J", "O", "U", "Z" heads cast # 3418915 with offset intake pushrod holes and 2.02"/1.60" valves

    1973 model year 340s used heads cast # 3671587 with 1.88"/1.60" valves (also used on 360s)

    pic of the head cast number and date code

    upload_2020-5-24_11-50-10.png
     
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  4. 340challconvert

    340challconvert Well-Known Member

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  5. AUSTA

    AUSTA Well-Known Member

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    FW340 should be a 1970 cast block
     
  6. AUSTA

    AUSTA Well-Known Member

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    Oh yes welcome back
    I would be very careful cleaning those heads up they appear to be open slots where the pushrods are like a TA /AAR head there is something written horizontally above the block number looks like 1072
    Also there is writing vertical around the middle looks to contains a few letters with KB in it
    Wire brushing may destroy the writing.
     
  7. volunteer

    volunteer Active Member

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    Lots of good info. My (one-owner) '70 Swinger with 'numbers-matching' everything has the '-915's with date-codes of 12-10-9 and 12-11-9- ,plus, 360 clearly cast into each one - - as do my 1973 (Challenger) -587's also with cast-in 360. The earlier -894's of course won't have '360' on them.