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Who has a sbc 400?

Discussion in 'The Garage' started by reddog64, Apr 27, 2002.

  1. reddog64

    reddog64 1/2 ton status

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    Dropping in a sbc 400 and want to hear the good, bad and ugly...
    will have a th400/np203 part time behind it
    260H cam in sbc400
     
  2. BorregoK5

    BorregoK5 1/2 ton status

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    I do, but its was stroked to a 415. And I'm running a th350/np203. What kind of info are you looking for? From a 350, its a direct bolt in swap, just make sure if you use your old heads, that you drill the steam holes in them, otherwise, its cake!
     
  3. Triaged

    Triaged 1/2 ton status

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    I have a 400 too. It even has the stock intake still/forums/images/icons/mad.gif.
     
  4. gtkustoms

    gtkustoms 1/2 ton status

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    I am running a few of them. I like them alot.
     
  5. BurbinOR

    BurbinOR 3/4 ton status

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    .030" over 400 here (406), love it, wouldn't do anything SBC but a 400 myself. Just keep it cool with a 4 row radiator and you're good to go.
     
  6. weisel

    weisel 1/2 ton status

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    Never had a problem with mine until it spun some berrings and trashed the crank. Something clogged the oil passages. Don't think it was the 400's fault though.
     
  7. reddog64

    reddog64 1/2 ton status

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    well i am getting a sbc400 for 600 bucks from a guy i know... sounds like a good motor. never hand a 400 before.. sionce my 468 went tits up... i need something... the 84 toyota celica i'm driving sucks ass!!! I want my truck back!!!

    Are alot of the parts interchangable between the 400 and 350?
     
  8. Sandman

    Sandman 3/4 ton status Author

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    I mud race with my 400 and it works real well. I don't push it much over 5000 rpm thou...
     
  9. Z3PR

    Z3PR Banned

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    I've got a 76 Blazer 100% factory stock with a 400 CID small block. I haven't owned the truck long, but the 400 sbc seams like a good strong motor. I do plan on building mine up next winter.
     
  10. jimmy88

    jimmy88 1/2 ton status

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    Make sure you use the flex plate for the 400 motor. The stock 400 has an unbalanced crank. Both the harmonic balancer and the flex plate or flywheel for the 400 have weights to balance the crank. If you use a regular flex plate you will get vibrations. You can (or could years ago) buy a special plate, about 1/16" thick, that bolts between the crank and the flex plate that lets you use a regular flex plate.
     
  11. Brady

    Brady 1/2 ton status

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    My wife has a 400 in her '79 Sub.It has loads of power and pulls my boat great.It now needs a rebuild though.She ran it low on oil.Now it has a rod knock.Time to yank it and slap a crank in it.
     
  12. BozoWise

    BozoWise 1/2 ton status

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    I also have a 1979 K5 w/ a sbc 400. It is all stock now and I am looking to do some upgrades. It runs very well with a bit off a rough idel though.

    What intake are you guys using? All I use this vehicle for is offroad cruising. Top speed of 65 is about all I need, but low end torque would be nice. I would also like to get rid of any of the "extra stuff" I can. There are a ton of vacum lines and smog crap that needs to go if possible. Any info on 400 upgrades would be neato
     
  13. BorregoK5

    BorregoK5 1/2 ton status

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    I've got all stock equipement on my 415's rotating assembly still so I could smog it, but it runs so well and is so powerfull I might just keep it like this while I build the rest. Lots of bottom end, great gas mileage, great midrange and a consistent top end. I'm moving to larger valve heads, an air gap manifold, headers and a decent try-y exhaust with cross over.. but still the setup us already great! (and I'm picky)
     
  14. bigmack

    bigmack 1/2 ton status

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    Both of my trucks have 400's (one 2wd and one 4wd), both are .030 over making them a 406. I think its one of the best motors GM ever made, they make alot of torque for a small block, I just rebuilt one & put in my 4wd 2 weeks ago. Yesterday was the first time I took it wheeling since I swapped it for the wore out 350 that was in it. Damn what a difference, it makes alot of power, you can just feel the torque it has at low RPM's. You will not be disappointed with the 400.
     
  15. Mreetz

    Mreetz 1/2 ton status

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    I'm also going to a 400, good to hear so many success stories out there. I'm going to a 406 and looking forward to getting out that tired old 305.........
     
  16. Z3PR

    Z3PR Banned

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    From a 305 to a 400 ??? You will deffently feel it !!!!!!
     
  17. Mreetz

    Mreetz 1/2 ton status

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    I'm a hopin to!!
     
  18. reddog64

    reddog64 1/2 ton status

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    can you tell me more about the flex plate...
    Ihave the flexplate off me BBC 454... it's going to a TH400...

    Will i need a flexplate off a SBC (262-400) or a flexplate for a 400sbc...

    What about a harmonic balancer...
     
  19. Triaged

    Triaged 1/2 ton status

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    You need a 400 dampner and flexplate with a 400. The crank is externally balanced and if you don't use the correct stuff will destroy the motor.
     
  20. Heavymetal

    Heavymetal 1/2 ton status Premium Member

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    I have a sbc 400, but is bone stock with just a K&N and headers. Its nice but nothing to brag about. I do like them though, I may be building up another sbc 400 to replace it with. I prefer the 400 simply because parts are cheaper, and it weighs less than a big block.

    My .02 cents,
    Mike.
     

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