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Technical Flathead Dual Exhaust & Mufflers

Discussion in 'Traditional Hot Rods' started by 42flattman, Jul 8, 2020.

  1. 42flattman
    Joined: May 22, 2020
    Posts: 18

    42flattman
    Member

    '42 Tudor Sedan......was thinking I would like to put on 2" dual exhaust....(or possibly 1-3/4") using the stock manifolds if possible....and running the tailpipes all the way to the bumper......looking for feedback from those that have maybe done this already and how difficult with some of the clearance issues I have heard about.
    Also, I am pretty sure I have decided on either Brockman Mellowtones or Cherry Bomb's so I would be interested in some thoughts on that if you care to share.
    Thanks !
     
  2. missysdad1
    Joined: Dec 9, 2008
    Posts: 2,945

    missysdad1
    ALLIANCE MEMBER

    Pipe diameter of 1 3/4" will give you the tone you want with a flathead with stock manifolds. I prefer Smithy's mufflers (Speedway Motors) to all others because they are mellow and look traditional. This combo will give your car an old school sound that won't be too loud or hard on your ears...or anybody else's.
     
    texasred, firstinsteele and Hdonlybob like this.
  3. tubman
    Joined: May 16, 2007
    Posts: 5,217

    tubman
    ALLIANCE MEMBER

    About 25 years ago, I put a set of Fenton cast iron headers on my '36 coupe. I built the system all the way back using 2" pipe. The only problem area was getting around the steering box. I was real proud of myself and bragged about it to everybody I met. Just about anybody who knew anything about it said the same thing as "missysdad1"; that 2" pipe was not necessary on a flathead, and in addition, would "kill the sound".

    I thought it sounded fine so I left-em on.
     
    King ford likes this.
  4. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 6,876

    Bandit Billy
    ALLIANCE MEMBER

    I used 1.75" all the way to the back, Smithys, red's headers on a 471 blown flathead and it sounds purrrfect!
     
    Hotrodmyk likes this.

  5. 1pickup
    Joined: Feb 20, 2011
    Posts: 920

    1pickup
    Member

    My '39 standard tudor runs out the back with NO MUFFLERS. Not really too loud. Pretty mellow & has a little bark when you hit the loud pedal.
     
    sawbuck, King ford and ERguitar like this.
  6. 42flattman
    Joined: May 22, 2020
    Posts: 18

    42flattman
    Member

    Looks like I will be doing 1-3/4"....probably with Brockman's (even tho the straight pipes sound interesting ??? will have to think about that some more, figured that might be too loud - maybe not with 1-3/4").....and will let a local muffler guy do it......he's been at it for 40+ yrs he said.....Thank you all for the input !
     
  7. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,140

    jimmy six
    Member

    With them back to the rear bumper you don’t need mufflers :rolleyes:
     
    210superair and sawbuck like this.
  8. Retrorod
    Joined: Jan 25, 2006
    Posts: 2,021

    Retrorod
    Member

    We run 1.75" to a pair of 30" glasspaks on the 8BA in the truck. It sounds really nice...not loud.
     
  9. xix32
    Joined: Jun 12, 2008
    Posts: 492

    xix32
    Member

    Jim Coffey in my old 5w.jpg
    In my `32 5window with a 59a block, I used Red's Headers and 1.75" Diameter "J" pipes and 22" Smithy's, all from Speedway. And one straight section of pipe from my local Napa store. I cut and fitted up and welded all the pipe sections myself. Since I thought finding a muffler shop with a pipe bender that could get the bends right where you want them would be a challenge.
     
  10. Old-Soul
    Joined: Jun 16, 2007
    Posts: 3,574

    Old-Soul
    Member

    On my '49 with stock 8BA I ran 1-3/4 off of Reds headers, no mufflers. Sounded great inside and outside the car.
     
  11. clo
    Joined: Mar 4, 2011
    Posts: 32

    clo
    Member

    On my 34 running a 59 block. I have red headers 1” 3/4 piping. The shortest brockman steel packs. Still to quiet.
     
  12. oldsman41
    Joined: Jun 25, 2010
    Posts: 1,282

    oldsman41
    Member

    I’m running 1 3/4 inch on my 51 merc flatty through smithys actually it is a bit to quiet
     
  13. krylon32
    Joined: Jan 29, 2006
    Posts: 6,633

    krylon32
    Alliance Vendor
    from Nebraska

    On my last flathead 32 roadster I ran 1.75 pipes and somehow forgot to install any mufflers. I loved it, with the pipes out the back everything sounded great.
     
    Jet96 likes this.
  14. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,263

    Atwater Mike
    ALLIANCE MEMBER

    Way back when, (1958?) I had Babe Royer's guy 'Brownie' fit my A-V8 (channeled '30 coupe with a 59A) with Belond headers, 1-3/4" pipe thru 32" Mello-Tones.
    Whole job, parts+labor was $49.00!
    Very quiet, but in a week had a "Woom, woom" sound.
    Lots of guys asked how I made it sound like that. I told 'em it was a hot rod, they all sound like that.
     
  15. Red's headers and Smithy's mufflers are like the Frank's Hot Sauce of hot rods... I put that sh*it on everything.
     
    Just Gary likes this.
  16. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 4,184

    sloppy jalopies
    ALLIANCE MEMBER

    Stockers had 8 cylinders running through one 1 7/8" pipe...
    I like to run a pair of 1 5/8" then I weld '32 to '38 steering column's top 6 inches [flare] as exhaust tips...
    had a lady I did not know walks up to me and pokes me in the chest, saying street rods have big pipes... get bigger pipes... I have run 1 5/8" pipes since just to spite her... whoever she was !
     
    Jet96 likes this.

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