Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

all BBc engines are external balancer ??

Discussion in 'The Garage' started by R72K5, Apr 10, 2005.

  1. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    ok i was talking to a local mechanic yesterday out here and we got into a few different interesting subjects

    one of them was about internal vs. external balance

    he says that all the chevy big blocks were external balance

    i was always under the impression that only the 454's were externally balanced-

    and that all the rest of the BBC engines were internal balance(IE use harmonic dampners- instead of crankshaft balancers)


    what is the true story ?

    this discussion between him and i began after he told me how and where he found his pontiac 400 he has in his 86 grand prix he built and drives now,

    he got it for free, found it literally in a scrap iron place, laying on the ground,..

    old 4 bolt one even.
     
  2. dodgedude99

    dodgedude99 1/2 ton status

    Joined:
    Jul 12, 2003
    Posts:
    784
    Likes Received:
    0
    Location:
    burbia of illinois
    396 and 427 i believe are internal, and all the others could go both ways i believe, but that just may be if its a OEM or custom motor build.

    ive been shopping for a 454 and been seeing those listed as internal or external.

    FYI, Fluidamper offers internal BB dampers.
     
  3. browningejm

    browningejm Registered Member

    Joined:
    Mar 23, 2005
    Posts:
    47
    Likes Received:
    0
    Location:
    LONG ISLAND, N.Y.
    454 is the only one that is externally balanced, the flex plate is specific to the 454. 396,402,and 427 use the same flex plate as a small block.
     
  4. bablazer73

    bablazer73 1/2 ton status

    Joined:
    Apr 4, 2000
    Posts:
    3,363
    Likes Received:
    0
    Location:
    upstate ny
    Yup, what he said. BUT don't go thinkin you can use a 400 SB EXTERNAL flexplate on a 454! It's different, even though it bolts on. I had a customer do that!! Took me a bit to figure that out!! :( :(
     
  5. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    so i was right all along and the mechanic is wrong ? only the 454 BBc's are external balance and the rest of the BBC's are internal

    right ?

    thanks
     
  6. HELLBENT DESIGNS

    HELLBENT DESIGNS 1/2 ton status

    Joined:
    Apr 2, 2005
    Posts:
    453
    Likes Received:
    0
    Location:
    bozeman mt
    yup! 366 stuff, i am not sure though. i think they share some 454 parts? :dunno:
     
  7. nvrenuf

    nvrenuf NONE shall pass! Premium Member

    Joined:
    Jan 7, 2002
    Posts:
    13,072
    Likes Received:
    245
    Location:
    Mobile, Al.
    As stated the 454 is the only externally balanced bbc, the 366 is still internally balanced.
     
  8. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    ok


    thanks
     

Share This Page