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Converting 350 to 400 SB?

Discussion in 'The Garage' started by eldon519, Jun 19, 2003.

  1. eldon519

    eldon519 1/2 ton status

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    Hey, I've been considering trying to build a 400 out of my 350 block I've got. First of all, I'm not entirely sure this is possible but if it is, how much can I expect all of the machine work to cost? Is it just alot of clearancing involved? Thanks.
     
  2. RustBuket

    RustBuket 1/2 ton status

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    I don't think its possible. I'm pretty sure they use too different blocks entirely. You could stroke it out to a 383 and bore it .060 over you might get up to say like 390 ish? /forums/images/graemlins/rolleyes.gif
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    Yeah not possible....maybe if you were a wizard or something /forums/images/graemlins/thinking.gif
     
  4. eldon519

    eldon519 1/2 ton status

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    /forums/images/graemlins/rotfl.gif
     
  5. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    You have a few good choices still
    350 355 383 or buy a 400
     
  6. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    You have a few good choices still
    350 355 383 or buy a 400
     
  7. blasterD

    blasterD 1/2 ton status

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    The 350 block has 4" bores that can be safely bored out .060 for a total of 4.060". You can possibly get more but you will run into reliability issues. The 400 block has siamesed cylenders (there is no water passage between the cylenders) that measure 4.125" you can bore these out about .060 too for a 4.185" bore. So, to answer your question, no. There are quite a few kits out there to make a 383 from a 350 block though.
     

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