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History Muffler Suggestion - Straight 6?

Discussion in 'Traditional Hot Rods' started by HuskerNation, Sep 13, 2019.

  1. HuskerNation
    Joined: Dec 28, 2010
    Posts: 307

    from Montana

    As I inch closer to getting my old 37 Hudson coupe running again, I wanted to get some ideas about choosing a muffler for the original straight 6 engine.

    Other than being a stock “refreshed” engine , the compression is being bumped to around 9:1. With exhaust coming off the top of the block I can’t come up with a good header design & I’d rather not go over the top of the engine with exhaust. Thus it’s a log roll style exhaust manifold of sorts.

    Now I know it’s a 6 cylinder & not a V8 or even straight 8. So I’m prepared that the sound will probably be uneventful but in case I’m wrong please let me know what may sound healthy & aggressive.... if that’s even possible for the old engine!

    Sent from my iPhone using H.A.M.B.
    Billybobdad and LOU WELLS like this.
  2. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,362

    from Idaho

    Show us a picture ... then we can show you where & how to split the manifold for duals.
  3. 41rodderz
    Joined: Sep 27, 2010
    Posts: 6,519

    from Oregon

    ^^^^^ yes pics please. Split exhaust is old school :cool:
    6-bangertim likes this.
  4. Mr48chev
    Joined: Dec 28, 2007
    Posts: 31,843


    Someone still sells their version of a Smitty glass pack and it doesn't get much more trad than that.

    On my 48 with the 292 I plan to run Porters The length still to be determined.

  5. FWIW, I had a single Smitty with 2 1/4" pipe on the 250 6 cyl in my Chevy truck, sounded like a rice rocket with a fart can. I put the muffler back into "stock" and got a Walker #17828 Sound FX that's about 6" round and 20" long. Its nice and quiet and not as annoying as the other one. When the truck had a SBC, I ran Smittys on duals and it sounded sweet, maybe with a 2-4 split manifold and duals it would have sounded good but not a single. Mitch.
    Last edited: Sep 14, 2019
    6-bangertim and Elcohaulic like this.
  6. David Chandler
    Joined: Jan 27, 2007
    Posts: 1,101

    David Chandler

    I ran a Cherry Bomb on a 250 Chevy and it was too loud. I even got pulled over for it eventually, and I was driving it "normally" in traffic. I replaced it with a Corvair Turbo muffler and it was far better sounding. Sixes on a single system really don't sound so good. Split, of course, that's totally different!
    Elcohaulic likes this.
  7. plym49
    Joined: Aug 9, 2008
    Posts: 2,803

    from Earth

    Split and the mufflers from a Jag XK 120, 140 or 150.
    Joined: Jan 24, 2010
    Posts: 2,441

    from IDAHO

    Twice Pipes With Harley Mufflers Should Be Distinctive.. 20170411_111945.jpg ..
  9. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,184


    Last edited: Sep 14, 2019
  10. 1pickup
    Joined: Feb 20, 2011
    Posts: 1,235


    My 250 in my wagon has a split manifold (3/3), & dual 12" glasspacks. It's not impressive. A little too loud. Maybe a little tractor-like. But it does exit in front of the rear wheel. If it was out the back, I think it would sound better.
  11. jvo
    Joined: Nov 11, 2008
    Posts: 247


    I'm thinking about what my mama told me.
  12. CA. 280
    Joined: Jan 8, 2010
    Posts: 226

    CA. 280

    Check out the "Leno's Garage" episode about Steve McQueens Jag. XKSS. Who knew an inline 6
    could sound so good.
    pitman likes this.
  13. the last 6 cylinder exhaust I did, was a straight pipe back, then split to each side. NO mufflers. sound like a race car.
  14. I did the same thing with a flathead six. HRP
  15. wvenfield
    Joined: Nov 23, 2006
    Posts: 5,506


    Back in high school a friend had a straight 6 in his car. In the 70's he would get ragged over that. One day he comes driving up with a cherry bomb on it.

    He steps out so proud and say "Hows is sound now". Without missing a beat and with a straight face my other buddy said "Like a 6 cylinder with a cherry bomb on it".
    Budget36 and slowmotion like this.
  16. How good are you at welding headers? If you want the best sound, a tri-Y works really well because it gives the illusion of more cylinders firing off and it mellows out the rough edges. Join the first 6 runners into pairs depending on your firing order at about 14" to 18" and then the bottom 3 at about the same length into a 2.50" to 2.75" collector, to a big, single, straight-through muffler. You can split the exhaust after the muffler if you want the dual tip look. That won't impact the sound of the exhaust note much, either way. Leave a straight section in front of the tips in case you want to add in resonators later.
    A big 6 can hold its own with an 8 because of the size of the cylinder pulses are generally equal. The tri-Y allows a bit of an echo that fills in between those fewer pulses which mellows the result. Another way to say it is....... some of each pulse splits into its neighbor and bounces back out as a ghost pulse behind the primary pulse.
    Last edited: Sep 14, 2019
  17. pitman
    Joined: May 14, 2006
    Posts: 5,151


    Excellent approach! ^^^^
    If you 'allow' pipe dia or # of outlets to increase for the rear portion,
    it deepens the note.
    Last edited: Sep 14, 2019
  18. I got a set of cast iron headers for my flathead six. Sounds great, mufflers gotten louder with age though.
  19. paintman27
    Joined: Apr 23, 2011
    Posts: 287

    from new jersey

    I first ran Brockman Mellowtones on my built 292 and it was way to loud. Partly because i dumped my exhaust just in front of the rear. I ended up taking the Brocks out and installed Flowmasters. 2 1/4 "in 2 1/4" out.
  20. 6sally6
    Joined: Feb 16, 2014
    Posts: 2,054


    2 1/4' thru a stock muffler. Make it as quiet as possible because it will NEVER sound as good as a V-8!
    Not being ugly just tell'in the truth.
    6 cylinders with "splits"....or straight pipes....or blowmaster 40's sound like crap to a car guy.
    If it ain't a big/honk'in/snotty idling V-8........don't even try. Just be quiet and cool.
    Baumi, tractorguy, jvo and 1 other person like this.
  21. Flat Six Fix
    Joined: Feb 6, 2010
    Posts: 1,271

    Flat Six Fix

    Thats funny, the other day I start my 55 Fargo truck with flathead 6 and dual exhaust with thrush mufflers for a visitor.
    I rev it up a bit then shut her down, guy says oh nice you got a V8 in there.
    I show him the engine and he gasps "wholly chit" thats a flathead
    To me it spunds good but not like a wicked
    Hnstray and Baumi like this.
  22. Twice pipes straight out the back !
  23. buick bill
    Joined: Dec 18, 2008
    Posts: 812

    buick bill
    from yreka;ca

    NOTHING SOUNDS BETTER THAN A 235 SPLIT ! just my opinion . split the manifold on my 292 and it didn't sound the same , or good . my 230 flatty in my 50 dodge sounds awsome with 12 inch glass packs . maybe a bit on the loud side though ! but 20 yrs. , no tickets so maybe not ! just put a set of headers on the 235 im putting in my 41 , but cant tell yet if the will sound like fentons . ive heard where you put the mufflers will make a difference . ! its all relevant ??
    Just Gary, BHR301 and Cosmo49 like this.

  24. Matter of opinion!

  25. 41rodderz
    Joined: Sep 27, 2010
    Posts: 6,519

    from Oregon

    I used to run Scotties , I think:confused: maybe Royal Scotts:eek: ok no a Chevy 6.
  26. Flat Six Fix
    Joined: Feb 6, 2010
    Posts: 1,271

    Flat Six Fix

    Okay Boyz and Girlz listen up
    Yes exhaust needs work and new piping..

    6-bangertim, Cosmo49 and indianbullet like this.
  27. jimmy six
    Joined: Mar 21, 2006
    Posts: 12,181

    jimmy six

    If your not splitting the manifold it won't matter much. I would go for quiet.
  28. 6sally6
    Joined: Feb 16, 2014
    Posts: 2,054


    Nice PJ's!
    tractorguy likes this.
  29. Flat Six Fix
    Joined: Feb 6, 2010
    Posts: 1,271

    Flat Six Fix

    WTF observant 1, it was 630 in the
    And yes this old beast lays rubber even with 3.23 gears.

    Attached Files:

  30. chopolds
    Joined: Oct 22, 2001
    Posts: 6,072

    from howell, nj
    1. Kustom Painters

    I'm a huge fan of a straight six, with split exhaust, and glasspacks. Brockman Mellowtones for me! I've got them on my 47 Chevy, with a 292, and they sound great.
    6-bangertim and Flat Six Fix like this.

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