'69 block imcompatible with aluminium heads???!!!

Discussion in 'Fox 5.0 Mustang Tech' started by stock50LX, Dec 30, 2003.


  1. stock50LX

    stock50LX Curmudgeon Founding Member

    Joined:
    Oct 3, 2001
    Messages:
    1,869
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    University Place, WA
    I was just told by a Summit salesman, who bothered to read the footnotes regarding Edelbrock heads, that my '69 351 block would need "steam holes" drilled to be compatible with the heads. Since he works on commission and he wants to sell the heads, his statement is credible. Does anyone have experience with this. It was the same with the TFS heads too.
    #1
  2. TIMMY2734

    TIMMY2734 Founding Member

    Joined:
    May 17, 2002
    Messages:
    1,331
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Queens, NY
  3. Ranchero5.0

    Ranchero5.0 The Voice of Reason

    Joined:
    Jan 1, 1999
    Messages:
    5,307
    Likes Received:
    0
    Trophy Points:
    76
    Location:
    Hagerstown MD
    Yep, the steamports changed over the years. It's better to drill a 1/8" hole in the heads to match your block. Just use the heads gasket as a guide and be done with it. I did the block last time and one of the bits tracked off a little in spite of being center punched. Aluminum is softer and easier to drill.

    Jamie
    #3
  4. stock50LX

    stock50LX Curmudgeon Founding Member

    Joined:
    Oct 3, 2001
    Messages:
    1,869
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    University Place, WA
    I don't have enough in the block, the head has more. Where did you drill them in your block? -just a half inch from the cylinder hole at the 1:00 o'clock position when looking down at the #8 cylinder? That seems to be the hole I am missing.
    #4
  5. PURESTREET5006

    PURESTREET5006 New Member

    Joined:
    Apr 2, 2003
    Messages:
    349
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    In the tech line for tear down"AGAIN"
    My block is from 1969 302 with a .060 over bore and i have lite weight heads on my car.
    #5
  6. Dark Knight

    Dark Knight Founding Member

    Joined:
    Feb 1, 2000
    Messages:
    2,578
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Chandler, Az.
    would NOT having that hole cause overheating?
    #6

Share This Page