406 vs 400 sbc

Discussion in 'How-To's / Knowledge Base' started by Link, Jun 4, 2018.

  1. Link

    Link Not-quite-so-new-guy

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    I am thinking of doing a 406 build and I was wondering if it would be better to just keep it a 400 for a budget drag build
     
  2. lilbowtie

    lilbowtie Royal Smart Person

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    If you have a measured good std bore why would you ?
     
  3. melloelky

    melloelky G-Body Guru

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    lilbowtie's right, if you don't have to why bother.depending on what your plans are come into play also.
     
  4. fleming442

    fleming442 Comic Book Super Hero

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    6 cubic inches is irrelevant unless it's on the end of your....
    Nevermind
     
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  5. bracketchev1221

    bracketchev1221 Greasemonkey

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    I would use whatever could get a clean hone with a torque plate and keep piston to wall acceptable.
     
  6. 88ss408

    88ss408 Master Mechanic

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    A 406 is a .030 overbore. If your standard bore is good run with it. But if you have to bore and can get away with .010 or .020 do that.
     
  7. 81msw79

    81msw79 Master Mechanic

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    I agree with all the statements above. A factory 400 block is notorious for issues once you start punching them out. The walls are thin to begin with compared to other sbc cores. If you need to clean up walls keep it light like 88ss408 suggested. I got lucky with my short block it is standard bore and clean. I am just going to hone it and rebearing bottom end with some new pistons.
     
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  8. Texas82GP

    Texas82GP Comic Book Super Hero
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    Totally agree. When I bought my car it had a 400 in it. It was pretty tired. I pulled the heads to take a look. It had already been bored 0.030" and had pronounced ridges at the top of the cylinders. The consensus was it needed to be sonically checked to see if it could take a 0.040" overbore. I sold it and moved on.
     
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  9. bracketchev1221

    bracketchev1221 Greasemonkey

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    Just don't lock yourself into weird engine sizes. Check piston availability for what you want to do in the size you are looking to go to. No point in going to .010 or .020 if race pistons will cost twice as much as shelf .030 pistons. SRP and JE have a large selection of bore sizes for the 400. But I don't know if this is in your budget.
     
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  10. Link

    Link Not-quite-so-new-guy

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