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small block big block conversion

Discussion in 'The Garage' started by biggun79b, Jan 11, 2006.

  1. biggun79b

    biggun79b Newbie

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    i have a 86 blazer full size has a 350 with 700r with 208transfer case changing to big block 454 what am i going to have to change if any thing
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Nothing, pull sbc out, stick bbc in. You will have to correct the exhaust pipe but that should be about it, oh and maybe do something about the lower radiator fitting size.
     
  3. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    larger radiator,
    different radiator top plate support
    lower hose changes a tad


    dist
    alternator
    flywheel
    motor mounts
    starter

    shoud all work, the water pump, and brackets are different though


    bigger gas tank
    more brakes
    and rent some space cause your smile will be huge!
     
  4. biggun79b

    biggun79b Newbie

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    Is ThE 700r Going To Handle The Big Block And Is There Any Thing I Have To Change On The Drive Train For Hook Up AS FAR AS LENGHT DIFERANCE BETWEEN TEH SMALL BLOCK AND BIG BLOCK AND HOW ABOUT THE DETENT CABLE IS THAT GOING TO HOOK UP
     
  5. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    if you drive in moderation...the yes the 700r4 should be ok, if its a stock motor with penut heads then its not a monster anyways, but the diffrerence will be huge.

    i have only run a t-400 behind my big blocks, for the cable qestion i cant help


    on thing to add though is that trucks and subs came with big blocks and small blocks, so its a faily straight forward swap. I would look into a reliable, recomended tranny shop to build you a qulity unit, also at the minimum add a cooler and a temp guage and NO nuetral drops,

    I would venture to say the rear axel would go first if you drive hasty with the big block :)
     
  6. biggun79b

    biggun79b Newbie

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    Thanks For The Help Got Coller And Guage Now And Axles Will Be Next If I Can Find Some 3/4 Tons That Is And I Would Like A 4 Speed If I Could Find One In My Area Most On Here Are To Far Out But Thanks For Teh Replies Tey Helped Alot
     
  7. hero

    hero Registered Member

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    Make sure your torque convert bolt pattern is the same....before you drop the engine in.
     

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