How much to cut out for fenderwell headers?

Early A-Body Discussions

  1. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    I,ve purchased some fenderwell headers from Hedman part #(75110-66),these were custom order so there...on there way.Does anybody have pics or measurements for how much of the inner fender I have to cut-out?I,ve seen Blownfishes and 66340sedan,s(Keith)jobs and they look very clean.Any help with some measurements,pics would help greatly.Thanks

    P.S These are going on my 1966 Dart with a 408 and P&P Eddy RPM,s.
     
  2. Longgone

    Longgone John/68 Barracuda & Dart

    Messages:
    7,102
    Likes Received:
    41
    Joined:
    Jul 12, 2005
    Location:
    Newport News, Virginia
    Local Time:
    7:06 AM
    Shouldn`t they come with a template?
     
  3. avarageerod

    avarageerod Well-Known Member

    Messages:
    1,423
    Likes Received:
    1
    Joined:
    May 13, 2009
    Location:
    North Carolina
    Local Time:
    7:06 AM
    mine are cut all the way to the shock tower, but its a hack job. It wasn't done by me.
     
  4. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    I,m not sure,they,re not being shipped til 03/26/10 another 2 weeks.Dang it!
     
  5. dartcuda1

    dartcuda1 67 Barracuda 500ci 6sp FABO Gold Member

    Messages:
    1,617
    Likes Received:
    55
    Joined:
    Dec 2, 2008
    Location:
    Malvern Pa
    Local Time:
    7:06 AM
    I hope this helps. Mark

    Picture 064.jpg

    255.jpg

    247.jpg

    258.jpg
     
  6. Longgone

    Longgone John/68 Barracuda & Dart

    Messages:
    7,102
    Likes Received:
    41
    Joined:
    Jul 12, 2005
    Location:
    Newport News, Virginia
    Local Time:
    7:06 AM
    Try to contact the header manufacturer or the retailer and see if either one has a template. They must have access to one somewhere.
     
  7. Blownfish

    Blownfish Well-Known Member

    Messages:
    1,084
    Likes Received:
    7
    Joined:
    May 26, 2009
    Location:
    St.Louis
    Local Time:
    6:06 AM
    Give me a few days and I'll try and get some measurements and I'll dig around to see if I have any photos of the engine compartment before I assembled the car, and no! they didn't come with any templates. I just cut away a little at a time until I got the fit I wanted.

    Just remember, with the Headmans, you will need to notch the shock mount or at least heat them and dent them.

    [​IMG]
    [​IMG]
    [​IMG]
     
  8. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    Thanks guys,I had noticed Keith(66340sedan)had kept a cutout piece and reattached after installing.Looks done properly.YooHoo K e i t h...:read2:
     
  9. dart4forte

    dart4forte FABO Gold Member FABO Gold Member

    Messages:
    4,589
    Likes Received:
    1010
    Joined:
    May 28, 2004
    Location:
    Mesa, AZ
    Local Time:
    12:06 PM
    What size tubes did you order? If you went with 1 3/4 you'll have to trim a bit more around the shock tower. you also may want to consider a brace for your shock towers.
     
  10. Super T

    Super T Thisfieldistooshort

    Messages:
    478
    Likes Received:
    0
    Joined:
    May 28, 2009
    Location:
    Aurora, IL
    Local Time:
    6:06 AM
    wow, dartcuda1 - how are you bracing the shock towers now?
     
  11. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    The headers are 1 7/8 tubes.Yes,braces will be in order for strength.
     
  12. GTXperience

    GTXperience Orig Stealth Mod

    Messages:
    7,689
    Likes Received:
    229
    Joined:
    Jul 13, 2007
    Location:
    Sacramento Area, CA
    Local Time:
    4:06 AM
    All I can suggest is the ol' (measure twice - cut once) method. Good luck and take some pics of the install.
     
  13. Burntorange70

    Burntorange70 Well-Known Member

    Messages:
    13,032
    Likes Received:
    73
    Joined:
    Feb 18, 2008
    Location:
    Aguanga, CA.
    Local Time:
    4:06 AM

    My dad likes to say.

    "I cut it three times and it's still to short"! LOL
     
  14. 1968FormulaS340

    1968FormulaS340 Well-Known Member

    Messages:
    11,545
    Likes Received:
    473
    Joined:
    Aug 24, 2005
    Location:
    St. Helens Oregon
    Local Time:
    4:06 AM
    Blownfish. The radius cut corners on your car really make all the difference world. Really gives it a look of quality and craftsmanship.
     
  15. Blownfish

    Blownfish Well-Known Member

    Messages:
    1,084
    Likes Received:
    7
    Joined:
    May 26, 2009
    Location:
    St.Louis
    Local Time:
    6:06 AM
    Thank you!

    I tried to take the extra steps where ever I could, I also filled the original hood hinge area since I was running a lift off hood and filled any unnecessary holes in the engine compartment that I could.


    Here are a few photos without the engine in the way. The right shock tower needs to have a pretty good size notch for the #4 header tube and the left side needs a small notch for the #3

    My cut line along the rear, runs where the fenderwell and the support on the firewall meet, then I just followed the shock tower along the front, you can pretty much see where they run along the top which I just cut out as I mocked it up. You may want to see how it fits in your car before you cut it because I have my engine raised about 1/2" above stock.

    You will need to get header collectors also, the Headmans are race headers and don't come with any. I bought a set of the 2 bolt Flowmaster collectors for mine, they look like oversized catalytic converter collectors. They have more ground clearance than your standard collector since they don't have the flange like the typical header collector, and they don't leak. You will also need to re-locate the little tabs they use to hold both halves together or they will tear up your front tires when they touch.

    The additional support wouldn't hurt but there is no reason for additional shock tower supports unless your running coil over shocks, it doesn't support the cars weight or anything and the notches are above the point where the shocks mount

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
     
  16. dart4forte

    dart4forte FABO Gold Member FABO Gold Member

    Messages:
    4,589
    Likes Received:
    1010
    Joined:
    May 28, 2004
    Location:
    Mesa, AZ
    Local Time:
    12:06 PM
    You will have to do some surgery around the shock towers. As far as braces it's been my experience that cutting around the shock towers creates stress in the unibody. Buddy of mine has stress cracks in the area of his shock towers. Of course his car wheel stands quite a bit and coming down that hard does put stress on that area of the body.
     
  17. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    Great pics Blownfish,thanks for taking the time to post.These will be saved for when it,s time for surgery.(next week)
     
  18. 66340SEDAN

    66340SEDAN FABO Member #3649 FABO Gold Member

    Messages:
    25,808
    Likes Received:
    22334
    Joined:
    Nov 20, 2006
    Location:
    Minnesota
    Local Time:
    6:06 AM
    I actually made those covers out of sheet metal, thanks for the nice comments, I will try to post some pics later tonite for ya!!!
     
  19. moparwedden

    moparwedden Well-Known Member

    Messages:
    796
    Likes Received:
    11
    Joined:
    Apr 13, 2006
    Location:
    trenton,ontario,canada
    Local Time:
    7:06 AM
  20. moparlee

    moparlee 64 Valiant

    Messages:
    1,379
    Likes Received:
    31
    Joined:
    Aug 18, 2004
    Location:
    Joplin, Mo
    Local Time:
    6:06 AM
    Mine are Mopar Performance which means they are Headman's that JR headers put on slip on collector's. Here is one picture of how much I cut up on top of the inner fender.

    pic 14.jpg
     
  21. moparlee

    moparlee 64 Valiant

    Messages:
    1,379
    Likes Received:
    31
    Joined:
    Aug 18, 2004
    Location:
    Joplin, Mo
    Local Time:
    6:06 AM
    How did you get that chrome heat shield to clear your headers....I have one of those and couldn't not get it to clear for nothing.
     
  22. moparlee

    moparlee 64 Valiant

    Messages:
    1,379
    Likes Received:
    31
    Joined:
    Aug 18, 2004
    Location:
    Joplin, Mo
    Local Time:
    6:06 AM
    here are some more shots

    IMG_0245.jpg

    LEECAR006.jpg
     
  23. pettybludart

    pettybludart Well-Known Member

    Messages:
    15,721
    Likes Received:
    120
    Joined:
    Jul 18, 2008
    Location:
    Ontario,Canada
    Local Time:
    6:06 AM
    Thanks for sharing Moparlee!All picks are helpful!=P~
     
  24. needsaresto

    needsaresto Well-Known Member

    Messages:
    7,787
    Likes Received:
    171
    Joined:
    Nov 13, 2004
    Local Time:
    4:06 AM
    Very cool threa! It's a well known fact that our A bodies have very limited header clearance. Thats why Im tossing the inners!!
     
  25. Blownfish

    Blownfish Well-Known Member

    Messages:
    1,084
    Likes Received:
    7
    Joined:
    May 26, 2009
    Location:
    St.Louis
    Local Time:
    6:06 AM
    It is close and I had too finesse a dent over the one tube but it fits.

    This brings up another tip with these headers, you have to have the MC off or moved out of the way to install the left header. I would also recommend using dot 5 brake fluid, it will help if you have any heat issues and it won't hurt the paint if you were to spill any.
     
  1. This site uses cookies to help personalize 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.