CUTLASS Olds 7A heads

Discussion in 'General Discussion' started by TURNA, Jun 12, 2018.

  1. TURNA

    TURNA Comic Book Super Hero

    Joined:
    Jul 24, 2009
    Messages:
    3,986
    Likes Received:
    1,896
    Trophy Points:
    113
    Location:
    Socialist NY
    The heads have the AIR tubes in them

    Anyone know what size thread they are or who makes a plug for them?


    Thanks
     
  2. High Roller

    High Roller Greasemonkey

    Joined:
    Aug 25, 2009
    Messages:
    198
    Likes Received:
    5
    Trophy Points:
    18
    Location:
    Cowtown USA, MN
    That'd be the roller cam 307, with the swirl oval port heads, I believe 1/4" pipe plugs.

    But you'd be better off if find set of the "5A" heads, found on 1980-85 307 engines. Install stock 350 valves (1.875" Intake and 1.562" exhaust) competition valve job, blend bowls, port/polish the ports and combustion chambers, mill heads 0.030", and run 3711 performer intake, and set of headers.
     
    • Like Like x 1
  3. olds307 and 403

    olds307 and 403 Comic Book Super Hero

    Joined:
    Oct 14, 2008
    Messages:
    3,174
    Likes Received:
    621
    Trophy Points:
    113
    Location:
    Melville,Saskatchewan
    I was lucky enough to have factory plugs I transferred over on various 307's I ran. Seems to me they are actually fine thread plugs. Above is good but you still have a 307 and better cam is definitely in order as well and is a roller cam, a custom grind reusing the stock lifters still isn't cheap, talk to Cutlassefi and the Cloyes billet timing set as well. Of course an Olds 350 or 403 is easier at that point.
     
  4. TURNA

    TURNA Comic Book Super Hero

    Joined:
    Jul 24, 2009
    Messages:
    3,986
    Likes Received:
    1,896
    Trophy Points:
    113
    Location:
    Socialist NY
    I just want to plug the air tubes?!?!?!?!?!?!?!?!?!?!?!!?!?!?!?!?!?!?!?!?




    :banana::banana::banana::banana:
     
    • Funny Funny x 1
  5. fleming442

    fleming442 Comic Book Super Hero

    Joined:
    Dec 26, 2013
    Messages:
    2,612
    Likes Received:
    939
    Trophy Points:
    113
    So, drill and tap them to the size you want.......
     
  6. TURNA

    TURNA Comic Book Super Hero

    Joined:
    Jul 24, 2009
    Messages:
    3,986
    Likes Received:
    1,896
    Trophy Points:
    113
    Location:
    Socialist NY
    would have to remove head then
     
  7. olds307 and 403

    olds307 and 403 Comic Book Super Hero

    Joined:
    Oct 14, 2008
    Messages:
    3,174
    Likes Received:
    621
    Trophy Points:
    113
    Location:
    Melville,Saskatchewan
    Try the NPT plugs, as long as they are close enough to seal. Also remove the tube end in the head before plugging.
     
    • Like Like x 1
  8. TURNA

    TURNA Comic Book Super Hero

    Joined:
    Jul 24, 2009
    Messages:
    3,986
    Likes Received:
    1,896
    Trophy Points:
    113
    Location:
    Socialist NY

    Is there a separate tube inside the head?

    Can it be removed without removing the head?
     
  9. olds307 and 403

    olds307 and 403 Comic Book Super Hero

    Joined:
    Oct 14, 2008
    Messages:
    3,174
    Likes Received:
    621
    Trophy Points:
    113
    Location:
    Melville,Saskatchewan
    Yes and yes. Just find something to jam inside the tube and remove it.
     
    • Like Like x 1
    • Useful Useful x 1
  10. spidereyes455

    spidereyes455 Greasemonkey

    Joined:
    Mar 6, 2013
    Messages:
    140
    Likes Received:
    15
    Trophy Points:
    18
    Location:
    Northeastern PA
    IIRC the threads in the head are not pipe threads but straight (picture brake line). That said I did used to use pipe plugs, however I used brass ones. The threads on the brass plugs would deform when tightened with enough persuasion and seal up quite nicely. As far as removal the ends of each tube are again like a piece of brake line in the heads so as long as you got the end with the flare on it out of the head your golden and can jujust jam a plug in there. Don't remember what size I used though just take one of the fittings to the hardware store and. Match it up to a pipe plug that will work.
     
    #10 spidereyes455, Jun 14, 2018 at 8:58 AM
    Last edited: Jun 14, 2018 at 9:05 AM
    • Like Like x 1
    • Winner Winner x 1
Loading...
Similar Threads - Olds heads Forum Date
CUTLASS Heads up, not mine, 1972 Olds 350 engine General Discussion Apr 17, 2018
350 olds heads General Discussion Feb 14, 2012
Olds heads General Discussion Dec 28, 2011
olds 350 heads on a 307? General Discussion Dec 7, 2010
EL CAMINO Engine Swap Buick 231 for Olds 350? General Discussion Thursday at 3:15 PM

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice