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Hot Rods help me identify my heads

Discussion in 'The Hokey Ass Message Board' started by miky2001, Jan 13, 2022.

  1. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    i got this chevy 350 motor and i dont know much about it, it runs good, but i would like to know where it came from.

    below are pictures of the casting marks on the heads.

    im confused.

    thanks in advance


    driver side head.jpg
    passenger side head.jpg
     
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  2. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    Last three digits of the casting number under the valve cover are probably 186 or 492. Post the letters and numbers from the pad next to the water pump leg and someone here will decode it for you.

    There s also a date code under the cover.
     
    Last edited: Jan 13, 2022
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  3. guthriesmith
    Joined: Aug 17, 2006
    Posts: 6,495

    guthriesmith
    ALLIANCE MEMBER
    1. H.A.M.B. Chapel

    Looks like two different head castings as best I can tell. One does look like a 186.
     
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  4. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    is the suffix (last three of the stamped number on the block) TCY, or something else?
     

  5. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    it looks like TCY, yes indeed
     
  6. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    TCY is a 1973 307 or 1982 305 C-10?
     
  7. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    so its not a 350 i guess?
     
  8. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    What is the casting number on the back of the block driver side above the bell housing flange?
     
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  9. My 186 heads look identical. Under the valve covers there is a casting number....give us that for a [positive I.D.
     
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  10. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    i need to go double check, i think it might be TJY

    I will have to try and get to that, very difficult to see, any tricks to get to see that?
     
  11. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    Ya in the car is sometimes difficult. A small mirror and a flash light? TJY is a 350.
    After another look those are two different heads.
     
    Last edited: Jan 13, 2022
  12. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    i went out and checked and this is what i found:

    stamp is V1221TJY

    stamp.jpg


    the passenger head says 3927186:
    passenger side casting #.jpg


    and the drivers side head says 3947041

    passenger side casting #.jpg


    the casting number is 3970010, i used some silly putty to find it, and flipped the picture around.

    casting number.jpg


    what sort of a Frankenstein motor do i have? like i said, it seems to run nicely. its got a cam in it.
     

    Attached Files:

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  13. Budget36
    Joined: Nov 29, 2014
    Posts: 8,436

    Budget36
    ALLIANCE MEMBER

    Wouldn’t run without a cam in it;)
     
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    The block is from a 1974 Chevy truck, according to the partial VIN C4F.... C means Chevy Truck, 4 means 1974, F is the assembly plant.

    The date codes on the heads show they're from other things.

    The 010 at the end of the block casting is what I'd expect for the block stampings. 350 block, most likely 4 bolt main, as used in lots of Chevy trucks and a few higher performance cars from 1969-1979.
     
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  15. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    Both heads are from model years 69-70 302/350 and functionally the same. That silly putty trick is clever!
     
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  16. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    I wonder if it has a 350 crank, or if it's a 327? :)
     
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  17. miky2001
    Joined: Nov 9, 2006
    Posts: 931

    miky2001
    Member
    from houston

    i dont suppose there is any way to find out? this is the cam specs:

    cam specs.jpeg
     
  18. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    you need to look at the crankshaft, or measure the stroke, to figure out what displacement it is. It' 97% likely that it's a 350. But you never know for sure...
     
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  19. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    I'd bet dollars to dimes it's a 350 and probably been bored and rebuilt at some time. I have similar Crower Monarch in one of my 327's and it was great but now sits under the bench waiting..
     
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  20. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    Dollars to dimes is only 90% likely that it's a 350 :)
     
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  21. Deuces
    Joined: Nov 3, 2009
    Posts: 21,964

    Deuces
    Member
    from Michigan

    I think '72 was the last year for the 307....
     
  22. Deuces
    Joined: Nov 3, 2009
    Posts: 21,964

    Deuces
    Member
    from Michigan

    186 and the 041 head castings are almost identical..... except for the casting numbers....
     
  23. tomcat11
    Joined: Mar 31, 2010
    Posts: 217

    tomcat11
    Member
    from Kalifornia

    Ya, math never lies. :(
     
  24. squirrel
    Joined: Sep 23, 2004
    Posts: 50,966

    squirrel
    Member

    68-73
     

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