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Hot Rods Buick 401 nailhead

Discussion in 'The Hokey Ass Message Board' started by vonwagers, Jan 18, 2020.

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  2. Yes

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  1. vonwagers
    Joined: Jan 18, 2015
    Posts: 107

    vonwagers

    Has any one on here ran a tripower on a buick 401 before if so how did it do. I have heard that the nailhead needs alot of cfm to run good . im just building a cruiser not a speed bullet .
     
    chryslerfan55 likes this.
  2. brigrat
    Joined: Nov 9, 2007
    Posts: 4,906

    brigrat
    Member
    from Wa.St.

    The Aluminum aftermarket tri power manifold leave a lot to be desired as far as flow & power. A single 4 will out perform most tri power set ups....................................
     
    Gman0046, vonwagers and ted kovacs like this.
  3. Moriarity
    Joined: Apr 11, 2001
    Posts: 15,778

    Moriarity
    SUPER MODERATOR
    Staff Member

    The 364 nailhead in my 55 has an offy 3x2 with Rochester 2gc’s and it runs great and really goes when the end carbs open up. But I admittedly don’t drive it very hard


    B03D0A6C-F175-4E1F-AF3C-92027ADFD4D0.jpeg 856E7A46-BF93-4D45-8765-2FD90B6FA1D9.jpeg 9087D354-626C-4617-ACCA-A3B28D0EA3E8.jpeg
     
  4. Come on Mark,,,,quit showing pics of your cars in the shape they are in,,,,at least clean and shine them up a little first,,,,,,LoL.

    Man,,,,that is beautiful as always !

    Tommy
     
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  5. no55mad
    Joined: Dec 15, 2006
    Posts: 1,825

    no55mad
    Member
    from nipomo, ca

    Stock cast iron 4 bbl manifold with Edelbrock 750 cfm works good. Check out Russ Martin's website.
     
    vonwagers and Nailhead Jason like this.
  6. brigrat
    Joined: Nov 9, 2007
    Posts: 4,906

    brigrat
    Member
    from Wa.St.

    Didn't Russ offer a service that reworked the Aluminum manifolds for better breathing?
     
    vonwagers and bchctybob like this.
  7. My buddy Ben had a tri power on his 401 in his A. He was never really happy with it. Finally swapped it out with an Eelco 2x4 setup, and man does it run better. Nailhead’s like a lot of carb from my experience. One 4bbl is good. 2x4 is better. The stock 2x4 intake is great. The Offy one flows like crap.
     
  8. Yes, he does surgery on the Offenhauser. The Weiand doesn’t need anything, it’s a very good intake.
     
  9. If your gonna do a tripower, do it with Rochester 2GCs. I’d do it with a straight linkage. A progressive is gonna starve it of air and fuel only on the center carb. 97’s on a straight linkage are only gonna flow around 550 to 600 CFC max at WOT. Its not enough.
     
  10. 55styleliner
    Joined: May 11, 2015
    Posts: 521

    55styleliner
    Member

    You can buy new Big 97s that flow 250cfm each for a total of 750. That should be enough.
     
    vonwagers likes this.
  11. yeah you could do that. I’m not big on the almost 500 bucks each for them, but they are really nice.
     
  12. 55styleliner
    Joined: May 11, 2015
    Posts: 521

    55styleliner
    Member

    I scored an Eelco 2x4 intake yesterday. Looks like I’m going with dual quads.
     
    belair and vonwagers like this.
  13. desotot
    Joined: Jan 29, 2008
    Posts: 1,801

    desotot
    Member

    My avatar has a 425 nailhead with an eelco 2x4 with a pair of 500 cfm thunder series carbs and it run excellent, but 3x2s look nicer imo.
     
    vonwagers likes this.
  14. vonwagers
    Joined: Jan 18, 2015
    Posts: 107

    vonwagers

    Thanks for all the info i think im going to stick with the 4 barrel for now and sell off the offy 3x2
     
  15. jaracer
    Joined: Oct 4, 2008
    Posts: 88

    jaracer
    Member

    I always liked the 3X2 setup I had on my 348. I drove the car for about 6 years with that setup, stock Rochesters with my own homemade progressive linkage. They are a bit finicky. If you don't open the end carbs for a while, the gas goes stale and the first time you get on it, it may not run that well. Once you get new fuel to the carbs it cleans up. The other problem is the end carbs not always returning correctly to idle. Even though the end carbs on the factory setup didn't have idle circuits, if the throttle plates didn't return to exactly the stop you had a big vacuum leak and poor idle quality. I learned to rev the engine and open then end carbs and then sidestep the throttle. That normally corrected the problem.

    I also have a 401 in my Model A. Haven't had it on the road yet, but I'm going with a single 4 bbl. I don't have room for multiple carbs.
     
  16. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,350

    alphabet soup
    ALLIANCE MEMBER

    Nailhead guys...is a 300 Buick considered a Nailhead??
     
  17. TimCT
    Joined: Jun 6, 2017
    Posts: 160

    TimCT
    ALLIANCE MEMBER

    No.
     
  18. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,350

    alphabet soup
    ALLIANCE MEMBER

  19. TimCT
    Joined: Jun 6, 2017
    Posts: 160

    TimCT
    ALLIANCE MEMBER

    Nailheads are easy to spot outwardly. The 264-425 engines had valve covers that, when looked at straight on, have tops as flat and straight across as the head of a nail. I believe the 300 was part of the next generation, standard Buick small blocks.
     
    Last edited: Jan 24, 2020

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