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Hot Rods Small block Chevy motor decode help.

Discussion in 'The Hokey Ass Message Board' started by guy1unico, Apr 18, 2019.

  1. guy1unico
    Joined: Aug 30, 2006
    Posts: 691


    What GM motor is this?
    When i look it up I'm getting mixed signals
    3970010 ...I get Z28 68 / 69
    Engine code
    V0428TDR...I get 78 or 80 Chevy truck
    Car VIN#
    C8F182 21...I'm lost here

    Any genuine help would be appreciated.
    Thank you,
  2. Calling Squirrel, we need you.:)
    Deuces likes this.
  3. I think it isn't a Z-28 engine, the truck thing seems more likely. Could be a 2-bolt or 4-bolt main engine.
    Montana1 likes this.
  4. partsdawg
    Joined: Feb 12, 2006
    Posts: 2,270

    from Minnesota

    TDR indicates 1980 350
    V is the plant the engine was assembled at
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  5. Slopok
    Joined: Jan 30, 2012
    Posts: 2,197


    I always thought they were all Corvette engines!;)
    Montana1, Deuces, mgtstumpy and 3 others like this.
  6. V indicates Flint, Michigan if I remember correctly.
  7. Fordors
    Joined: Sep 22, 2016
    Posts: 1,833


    1978 350/155 horse, 4 barrel, automatic trans, conventional cab truck, California emissions.
    Stamping on engine tells us this-
    V is assembled at Flint Michigan, and 0428 is April, 28th.
    The C8...... in the vin denotes Chevrolet, 1978.
    Deuces, mgtstumpy and lothiandon1940 like this.
  8. I have lost the information for the engine code, but the casting number is for either a 69, 302 Camero 4bolt, or for a truck, either 2 or 4 bolt block.
    I used to have the complete list from Super Chevy to interpret the stamped codes, but I have torn the house apart twice looking for them, and have not been able to find them. I will have another look tonight.
    I have an engine from a 73 Canadian GMC 3/4 ton van with the same casting number. It is a 4 bolt engine.
    Last edited: Apr 18, 2019
  9. i.rant
    Joined: Nov 23, 2009
    Posts: 2,440

    from Illinois
    1. 1940 Ford

    The block casting #3970010 is very common.It covers a wide range of uses over the years.
  10. guy1unico
    Joined: Aug 30, 2006
    Posts: 691


    Are you positive it is not a 302 1978 Z28 motor???
  11. Fordors
    Joined: Sep 22, 2016
    Posts: 1,833


    Yes. Mostly because there was no 302 engine in 1978.
    Deuces and XXL__ like this.
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 42,356


    78 chevy truck, pretty obvious...the Txx suffix means truck, the C at the beginning of the VIN means Chevy truck, the 8 in the Vin means 1978
  13. XXL__
    Joined: Dec 28, 2009
    Posts: 1,644


    So... definitely Corvette.
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 42,356


    heh....yeah, but they all are right? unless they're a z28 cross ram
  15. I found my suffix tables, and this is the decode
    cu in trans, HP barrels Vehicles
    1972 TDR 350 conv. cab, a/t 175 4 K-10 & 20

  16. aaggie
    Joined: Nov 21, 2009
    Posts: 2,521


    Nothing special about it but check for cracks and defects then you can build almost any SBC with it. Should be cheap to buy.
  17. joel
    Joined: Oct 10, 2009
    Posts: 1,468


    If it’s a 4 bolt 0010, you have a choice to build a 302,327,350 or even a 383. If it’s .030 over, and low wear such that.040 over is possible, ok, otherwise pass.

    Sent from my iPhone using H.A.M.B.
  18. 54vicky
    Joined: Dec 13, 2011
    Posts: 1,012


    seems like you want someone to agree with your conclusion.if it makes you feel better than that is what you think it is.yes the meds will h
    elp as time passes delusions are a hard thing to cure
  19. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,513


    OK, now go out and buy a Corvette; install that engine in the Corvette; now remove it from the Corvette, and sell it as coming out of a Corvette. Pretty simple really. Personally, I'd put it back in a truck, where it belongs. I am Butch/56sedandelivery.
    Truckdoctor Andy and XXL__ like this.
  20. Jimbo17
    Joined: Aug 19, 2008
    Posts: 3,454


    I had a similar engine that was a 350 and I ran into a major problem with mine.

    When it was time to replace the starter motor I purchased a new one but did not think to measure the bolts or to ask if they were metric or standard before I installed it.

    I installed the new starter motor and after about a month it would start to grind so I replaced the flywheel, shimmed the stater motor and also put a bracket on the starter motor for more support.

    After replacing a few more starter motors I noticed a few small cracks around the outside bolt hole caused by using the wrong bolts!
    Between the late 70's and the early 80's starter motor came with both metric and standard bolts and the problem was they were not the same in diameter or length once torqued down down they caused the cracks.

    My motor was out of a 1977 or 78 Corvette.
    Do not install a New Starter motor until you have checked the bolts or you may be destroying a good engine.

    I could not find which years Chevrolet changed from standard to metric bolts in these engines.
  21. Gerrys
    Joined: May 1, 2009
    Posts: 326


    Every SBC is a corvette motor.
    XXL__ likes this.
  22. Dick Stevens
    Joined: Aug 7, 2012
    Posts: 2,491

    Dick Stevens

    Except for the one I have :oops:
  23. I have two "010" motors that came out of medium duty C-60 school buses from the mid 70's.
    Both are 4-bolt 10-20 blocks. ;)
    lothiandon1940 likes this.
  24. squirrel
    Joined: Sep 23, 2004
    Posts: 42,356


    They all use 3/8-16 bolts. but that does not prevent people from using the wrong bolts in them, or otherwise screwing up the threads in the block.

    the fun thing is that later starters use metric bolts, but only PART of the bolt is metric! the shank, not the threads. These trick bolts are really confusing if you dont know what's going on

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