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Reversing an A firewall ?

Discussion in 'The Hokey Ass Message Board' started by Bill.S, Nov 20, 2005.

  1. Bill.S
    Joined: May 5, 2004
    Posts: 449

    Bill.S
    Member
    from NW OH

  2. Scott
    Joined: Dec 23, 2004
    Posts: 2,707

    Scott
    Member

    I gained enough room for SBC with space to spare.
    and it actually clears bellhousing. there is a loss of leg room and pedal swing, but Im only 5'7"
    [​IMG]
     
  3. Chopped Tudor
    Joined: Feb 14, 2005
    Posts: 305

    Chopped Tudor
    Member
    from DETROIT

    i did works great
     

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  4. Bill.S
    Joined: May 5, 2004
    Posts: 449

    Bill.S
    Member
    from NW OH

    Thanks for the pics.
    I guess I'll take the one out thats in there and
    try the other one reversed and see what it looks like.
     

  5. Rusty
    Joined: Mar 4, 2004
    Posts: 9,449

    Rusty
    Member

    By the sounds of it, is this a direct fit when you reverse it?
     
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  6. Boones
    Joined: Mar 4, 2001
    Posts: 9,623

    Boones
    Member
    from Kent, Wa
    1. Northwest HAMBers

    you will have to cut off the lower section at the Toeboard I believe
     
  7. Kevin Lee
    Joined: Nov 12, 2001
    Posts: 7,410

    Kevin Lee
    Super Moderator
    Staff Member

    Check out Pictures of JimA's RPU. Coolest reversed firewall I've seen. Whoever did it took the time to chop the bottom corners off and rework them - or maybe they were never seperated from the body?

    However it was done it looks right.
     
  8. Paul
    Joined: Aug 29, 2002
    Posts: 15,025

    Paul
    Editor

    JimA's
     

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  9. JimA
    Joined: Apr 1, 2001
    Posts: 4,796

    JimA
    BANNED

    My friend Lynn Bird did the slick metal work on this. The gain was 4-inches- the toe board area was returned to stock config. after the upper was reversed. NO foot room was lost, but 4 more inches really helped with distributor clearance.
     
    kidcampbell71 likes this.
  10. CaseyK
    Joined: Jan 27, 2004
    Posts: 386

    CaseyK
    Member

    I'm doing somthing similiar right now, using 2 firewalls. I cut the outside radius of my original one because it was a late 31, so it had the recess in the passenger side, then will cut out the center of the 2nd one so the K detail faces the stock direction, weld them together, finish the bottom portion with the stock mounts and she's done. I want it to look stock, but not?

    Casey
     

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  11. GO-rilla
    Joined: Dec 29, 2004
    Posts: 744

    GO-rilla
    Member

    Good stuff...
     
  12. Rusty
    Joined: Mar 4, 2004
    Posts: 9,449

    Rusty
    Member

    Now that is sweet and I just happen to have a extra one laying around. Wonder if this will give you plenty of room for a nailhead?
     
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  13. Bill.S
    Joined: May 5, 2004
    Posts: 449

    Bill.S
    Member
    from NW OH

    JimA & Nashman, how far back are your radiator
    rod mounts from the front edge of the cowl?
    That looks like the way I'm going to go.
     
  14. Dan
    Joined: Mar 13, 2001
    Posts: 2,367

    Dan
    Member

    glad this thread has come up, am thinking of doing the same in my A. Scott, could you do me a favor? How far from the front of you block (like the flat surface where the timing chain cover bolts to) to the back of your front crossmember? Trying to get a ball park figure on where to put my engine mounts without setting the engine and body in/out, off/on a bunch of times (i.e. I work alone with no hoist :) )
     
  15. 55olds88
    Joined: Jul 23, 2001
    Posts: 2,383

    55olds88
    Member

    Yup good thread, anyone else got any info or pics, might help gain some space for a Rocket in there.....
     
  16. Boones
    Joined: Mar 4, 2001
    Posts: 9,623

    Boones
    Member
    from Kent, Wa
    1. Northwest HAMBers

    I just took the stock one and fabbed a 3.5" band to go around the outside to allow mine to set back.
     

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  17. This is my 1931 Ford model A body, which is not channeled, with a 4" recess built into the firewall, which is the perfect size for a small block Chev V8. It leaves plenty of foot room, and as far as I know would not cut into the original gas tank position. It's a bit hard to tell, because the gas tank was cut out of my body when I bought it, however a friend of mine has the same body with a functional uncut gas tank, and he is running the same recess as mine has.

    brianrupnow has attached this image:
    [​IMG]
     
    kidcampbell71 likes this.
  18. I know that this isn't what you asked for, as far as a reversed firewall goes, however----This is a non reversed firewall that I built a 4" recess into, and it worked out very wall. The recess does not require a lot of complex metalwork, and it leaves more clearance under the dash.
     

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    kidcampbell71 likes this.
  19. Now thats FOOSE. Change it, but make it seem like it wasn't. Damn nice work!



     
  20. The Bomber
    Joined: Dec 10, 2005
    Posts: 529

    The Bomber
    Member
    from mass.

    Any step by step pics when Jim A’s firewall was reversed and re done! Thanks for any help...Dennis
     
  21. The Bomber
    Joined: Dec 10, 2005
    Posts: 529

    The Bomber
    Member
    from mass.

    Any step by step pics when the firewall was reversed? Thanks for any help...Dennis
     
  22. Canuck
    Joined: Jan 4, 2002
    Posts: 1,048

    Canuck
    Member

    Reversed along the line of spot welds, then a section cut out and by using a hammer formed band to gain a additional 3". Custom rad support rods to place the rad in stock location. That Buick is a long engine.
    upload_2020-4-11_20-9-35.png
     
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  23. fiftyv8
    Joined: Mar 11, 2007
    Posts: 5,120

    fiftyv8
    Member
    from CO & WA

    For a SBF or SBC engine in a Model A you could consider what I call recessing the firewall about 4 inches.
    In some cases reversing a firewall may achieve that magic number.
    I am not a fan of using a wheel barrow bowl for this purpose, but then again each to his own.
    A recess done with a bit of forethought, no cutting corners and a decent amount of effort should provide a decent outcome.
    For a 28/29 Model A firewall I like this type of recess.
     

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