One more engine ID

Discussion in 'VIN, Trim Tag & Drivetrain Decoding' started by arm2004, Jan 15, 2019.

  1. arm2004

    arm2004 Member

    65
    6
    May 5, 2017
    S.E. Ohio
    dont know much about the history of car or motor. 68 camaro flipped 2 or 3 times but is junk. I was told a 307 so i needed some internal parts tear it down I find- 4 barrel cast intake, 194 heads 4 bolt main, GM double roller roller timing chain.
    Cast codes- 3970010
    Pad- 617430 stamp
    Oil filter- 138N. WR. 010
    Timing chain- 3735412 GM #
    Checked stroke it is a 350.
    But the stamped pad has me guessing. Run numbers on timing chain and a bunch of early V-8 and a truck motor. Any help on this is it worth keeping? Hate to scrape a 4 bolt block.
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

    21,637
    491
    Apr 14, 1999
    Bismarck, North Dakota
    All I can tell from the numbers is that the 3970010 block is a 4" bore block. That block can be used to build 302,327, and 350 engines. If you checked the stroke and it is 3.48", then it is a 350 like you thought.
    I can't decode the 617430 number to mean anything.
     
  3. tom3

    tom3 Veteran Member

    11,384
    206
    Aug 1, 1999
    ohio
    Might look on the back of the engine, bell housing flange, see a date code cast into the top part of the flange.
     
  4. arm2004

    arm2004 Member

    65
    6
    May 5, 2017
    S.E. Ohio
    Here are the stampings. I can’t find anything on date codes.
     

    Attached Files:

  5. arm2004

    arm2004 Member

    65
    6
    May 5, 2017
    S.E. Ohio
    Here is the timing chain in the motor. Has me confused nothing makes sense on this motor. But it is a 350 4 bolt main with stock pistions.
     

    Attached Files:

  6. tom3

    tom3 Veteran Member

    11,384
    206
    Aug 1, 1999
    ohio
    That is an odd one I'm thinking. The number pad on the front is a small pad, never saw this on an early 010 block that I remember. Double row chain is real odd too, looks to have a GM number.
     
  7. arm2004

    arm2004 Member

    65
    6
    May 5, 2017
    S.E. Ohio
    I have a 350 out of a 71 vette that has a small stamp pad on it no numbers left on it after decking. Been in a lot of SBC motors never seen a GM double roller chain before. I was just confused on what the engine was see if any Gm experts knew where it came from. Nothing looks like it should.
     
  8. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

    26,310
    618
    Feb 26, 2004
    Bloomington, MN
    Googled the timing gear sprocket.
    Collected the whole set!

    upload_2019-1-16_20-45-43.png

    "Heavy duty off-highway use" (wink, wink) parts you can order at your local GM dealer parts counter!
    Does that mean it's a "Performance" part and it's not certified by some authority to be street legal or installed from the factory?

    So... It could have come from someone's hot-rodded 'Vette or it could have been pulled from a sunken boat. (MerCruiser)
     
  9. 79RedZ

    79RedZ Veteran Member

    649
    32
    Mar 24, 2009
    Hamilton,MI
    With the pad, being under the alternator, being small like that makes it a 1977 and up small block. I think the 010 blocks were used up until 1980.
     
  10. Gary S

    Gary S Administrator Lifetime Gold Member

    21,637
    491
    Apr 14, 1999
    Bismarck, North Dakota
    The lack of more numbers stamped on the front pad says to me that your engine could be a late 70s Targetmaster engine. During that time, the 3970010 block was being used for Targetmaster engines. A couple of years later, a different block was used for those engines.
     
    2ndGenCrazy likes this.

Share This Page