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Thread: Head porting ?

  1. #1
    Join Date
    Aug 2005
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    Paoli Indiana
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    Head porting ?

    Is it necessary to port the exhaust ports on the heads? I started gasket matching mine is it a bad idea? or a help? looks like the ports on the exhaust manifolds are MUCH larger than the ones on the heads so......
    93 SC Red Aod 4.2/2.3lwhipple 422rwhp 11.360
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  2. #2
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    There is supposed to be a lip on the Head exhaust ports to prevent exhaust gasses from feeding back into the heads. But as far as porting, im not really sure.

    - Dan

  3. #3
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    Paoli Indiana
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    So leave the lip?????
    93 SC Red Aod 4.2/2.3lwhipple 422rwhp 11.360
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    2018 Shootout Pro Street Runner Up
    Coming soon new motor 2300 TVS etc..
    90 35th aod stock, 90 5 speed Bolton Build in progress

  4. #4
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    Does anyone know if this lip should be left????
    93 SC Red Aod 4.2/2.3lwhipple 422rwhp 11.360
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    2018 Shootout Pro Street Runner Up
    Coming soon new motor 2300 TVS etc..
    90 35th aod stock, 90 5 speed Bolton Build in progress

  5. #5
    Join Date
    Jul 2003
    Location
    Ottawa, Ohio
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    5,436
    do not port match the exhaust side just smooth and polish it up. do a search there are tons of threads on head porting. This is also an informative link

    http://www.sa-motorsports.com/do-it-yourself.aspx
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
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  6. #6
    Join Date
    Apr 2005
    Posts
    230

    heads

    what if i took the lip off and gasket matched it? would this be a huge problem? don

  7. #7
    Join Date
    Jan 2007
    Posts
    132
    A lip can be good for anti-reversion. If you are staying with stock manifold, I would leave the port size alone and concentrate your efforts on making them smooth and straight. The problem is the firing order and reversion is a problem on most manifold designs. Longer primaries will help but unless you are going to build your own bundle-of-snakes 6-3-1 (1&5 2&6 3&4, each primary 180' out) exhaust, reversion is a concern.

    Also, the further you port the stock exhaust manifold primaries, the further you can open up the exhaust port and still have the same degree on anti-reversion.

    Jason

  8. #8
    Join Date
    Apr 2005
    Posts
    230

    porting

    well i already ported it to match, so ill have to see if it helps or not. ill let you know once the car is together and running. don

  9. #9
    Join Date
    Apr 2004
    Location
    sumter, south carolina
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    3,050
    here's a good head porting thread for u members :

    http://www.sccoa.com/forums/showthre...orting+exhaust

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