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Features The 400 Jr. Sound

Discussion in 'Traditional Hot Rods' started by J.Ukrop, Feb 24, 2023.

  1. J.Ukrop
    Joined: Nov 10, 2008
    Posts: 2,439

    Staff Member

    J.Ukrop submitted a new blog post:

    The 400 Jr. Sound

    Continue reading the Original Blog Post
    Last edited: Feb 24, 2023
    41 GMC K-18, v8flat44, Louie and 10 others like this.
  2. Tim
    Joined: Mar 2, 2001
    Posts: 15,012

    from KCMO

    Good stuff
  3. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 1,867

    wheeltramp brian

    That thing genuinely sounds really really good!
  4. Tim
    Joined: Mar 2, 2001
    Posts: 15,012

    from KCMO

    We need a thread of everyone’s favorite video of a 400jr car cackling. @oldsboy is my favorite but I don’t know if I’ve a video to share.

  5. Nobey
    Joined: May 28, 2011
    Posts: 1,439


    Now that's music......
  6. 40two
    Joined: Feb 19, 2012
    Posts: 2,174


    Well written, Joey. What a sound, i can nearly smell that car.
  7. Tim
    Joined: Mar 2, 2001
    Posts: 15,012

    from KCMO

    Running nitro but I bet that’s the 400jr
  8. sololobo
    Joined: Aug 23, 2006
    Posts: 8,361


    Wonderful sounds, Tim's post is awesome as well!
  9. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 1,867

    wheeltramp brian

    That one running Nitro sounds great and I bet it smells good too:)
    Outback, Just Gary and Tim like this.
  10. I got to drive a Model A with an 8ba with a 400 jr, and straight pipes. That was the meanest sounding flathead I had ever heard at the time!
    49ratfink and Tim like this.
  11. I can only hope the B4Cdan sounds half this good.
    49ratfink likes this.
  12. WB69
    Joined: Dec 7, 2008
    Posts: 1,954

    from Kansas

    How can anyone not like that sound?
    49ratfink likes this.
  13. I also have that cam in my engine. Open headers all of the time too. A second carb and a bump in compression would really wake that roadster up with that bumpstick, it really comes alive near full song.
    Adriatic Machine, Tman and Tim like this.
  14. Lakeside65
    Joined: Aug 17, 2021
    Posts: 180


    A killer duece roadster hiding in my town?? I'll find out if he's still got it because I need to check it out if so.
  15. sshep
    Joined: Oct 13, 2018
    Posts: 222


  16. caprockfabshop
    Joined: Dec 5, 2019
    Posts: 334


    Aw, you're making me regret the Isky Max....
  17. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,615

    el Scotto
    from Tracy, CA

    Man!! That sounds good!! Wonder if she runs as hard as she sounds!
  18. NoSurf
    Joined: Jul 26, 2002
    Posts: 4,370


    I heard he sold the chassis and the body separately a few years ago.

    I probably listen/watch that video once a week.
  19. HomemadeHardtop57
    Joined: Nov 15, 2007
    Posts: 4,302


    I love a good 400 jr!
  20. lostn51
    Joined: Jan 24, 2008
    Posts: 1,702

    from Tennessee

    Dang that rascal sounds good!! I have one of those cams in a box somewhere and wasnt going to use it but I changed my mind
  21. 50 Merc Man
    Joined: Aug 2, 2020
    Posts: 367

    50 Merc Man

    Sounds badass bro!!!! Happy motoring!!!!
    dwollam likes this.
  22. krylon32
    Joined: Jan 29, 2006
    Posts: 8,700

    from Nebraska

    My engine builder tried to talk me into a 400JR but I was a pussy and went with an 88. Still has a racy sound runs good and will be fine in my newest deuce roadster with straight pipes.
  23. dwollam
    Joined: Oct 22, 2012
    Posts: 1,976


    35 years ago I was building a '52 8ba for my '40 Tudor. Did all the machining but never assembled. Now it is going together for my '32 Fordor. I told the cam grinder I wanted a lumpy cam with low torque on the bottom end so I wouldn't be breaking the '40 trans like I did as a kid. He recommended the 400Jr. It should work good in the '32 with 4.11 gears and lighter weight. They sure sound good at idle!

  24. fabricator john
    Joined: Mar 18, 2010
    Posts: 261

    fabricator john
    from venice fl.

    gentlemen after 2yrs of collecting parts im headed in , half way there with my upgrades . 400jr degreed in , working out installed spring height, machined keepers , goin to 8.1 to 1 sharp heads , navarro race model dual , mallory yb , plus a whole bunch of lil stuff ,ill put up vid when i get it to come alive !! cant wait , now if i had unlimited funds ,no family and job responsibilities i could really knock this out !!!
    actually the 400jr was the cam dad always wanted ,, so here i am
    fabricator john
    miss you dad
    Outback and dwollam like this.
  25. 1pickup
    Joined: Feb 20, 2011
    Posts: 1,258


    Nothing better than that!
  26. jnaki
    Joined: Jan 1, 2015
    Posts: 7,951



    Nice story… Wow, if that sound was from a Isky 404 cam, perhaps I could have come up with some money to buy one for the underpowered Flathead motor in my 1940 Ford Sedan Delivery. Then, maybe I would have enough power to make the climb up those steep coastal hills with some oomph and not down shift to 2nd or 1st.
    Also, I would have been able to go up to the gathering of the tribes during Christmas Vacation in the local mountains. (Except for this year due to the overabundance of snow + rain) Although it would have been cold in the empty rear cave, it would have been fun.

    Not only that barrier crossed over, but the sound of the 40 Ford Sedan Delivery idling through the local drive-in restaurant parking lots would have taken away the award for the “fastest of the slowest” hot rods and customs in the area title. We did see a built up Flathead motor at Reath Automotive, but the cost was too much for this relatively empty pocket book. So, this would not have broken the bank to buy and install. Maybe add a couple of carbs to go along with the cam.


    The Impala would have taken turns going up the steep roadways into the local mountains. In the place of a under powered Flathead motor not having enough power to go up the steep mountain roads, the Impala did its duty, happily. But, the sedan delivery with the Isky 404 cam would have been in a world by itself, all along the coast of So Cal. Steep hills or not.

    Perhaps, the modified Flathead motor would have been a little cold with the empty shell in the back cave. But, I think of the extra power a cam would provide and it would have been a smile from ear to ear… in the cold mornings at the beach or freezing weather in the mountains… YRMV
  27. v8flat44
    Joined: Nov 13, 2017
    Posts: 1,168


    I hear the sound of music, my favorite kind of music still my heart
  28. Here is a little flathead music for you . . . 284 CI full-race style flathead . . . with a roller cam.


  29. Joe Reath was my original flathead mentor . . . my Mom started driving me to his shop on Cherry in Long Beach when I was 15. I had acquired an engine that came from Kenz & Leslie of CO and it was my first build. Joe was a heck of a good guy and spent a TON of time with me. He introduced me to Ed Isky, Joe Hunt, Moon, Cook's Machine and a whole host of others. He even came out to Irwindale to watch me race in the Antique Nats (managed to win my class the couple years I raced). I can see him now behind the counter when Mom and I first rolled in to see him. ;)

    I still have the K&L block - and recently acquired a Hilborn flathead injector that K&L ran. Now I need time to put that one together . . . but it is behind the FlatCAD Bonneville engine I'm currently in the middle of redoing.
    alanp561, jnaki and Big Al like this.

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