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396 +.125

Discussion in 'The Garage' started by 76zimmer, Jun 5, 2006.

  1. 76zimmer

    76zimmer Flyin Rat Premium Member GMOTM Winner

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    I heard of it being done to get a 427, but has anyone had 1st hand experience with this? I have a line on a 396, 325hp from a Camaro, and was just thinking?
     
  2. 3 on the tree

    3 on the tree 1/2 ton status

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    Back in the day, we used to do that, but ONLY with 65 blocks. They were supposed to be the same core as a 427, so lots of meat in the cylinders.
     
  3. rcamacho

    rcamacho 1/2 ton status

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    Only way to tell is a sonic check. It may be possible with a sleeve, but the cost would be prohibitive for the latter...
     
  4. ak bandit

    ak bandit 1/2 ton status

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    What can you do with a 427 that you cant do with a built 408 (396 w/ .060" overbore)? :D
     
  5. fabjunkie

    fabjunkie 1/2 ton status

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    Why overbore (especially that much) if you don't really need it? Other than to say, "Mine is bigger than yours."?
     
  6. yoshisv

    yoshisv 1/2 ton status

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    396+.125= Hot spots and over heating
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Heck, 396+ just whatever it takes to clean up the bores=more life down the road.

    If you want more cubes, go get a 454+ and leave the smaller stuff to the nostalgia crowd. :)
     
  8. sweetk30

    sweetk30 professional hooker Premium Member

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    396 and 402 same basic block.

    427 and 454 same basic block.

    396 and 402 and 427 same cranks stroke .

    454 bigger stroke.
     
  9. 76zimmer

    76zimmer Flyin Rat Premium Member GMOTM Winner

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    This all basically came out of a beer/bench racing session.....I'm sure you know how those can get. Anyhow some say yes, some say no. Just wondered if anyone has done it for themselves, and the results after hitting it hard.
     
  10. 3 on the tree

    3 on the tree 1/2 ton status

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    Like I said earlier, I did this back in the 70s. ONLY the 1965 396 blocks were capable of boring 1/8". Even the lopo 325 horse motor used the same block as the 375 horse version. We used to scour junkyards and grab every 65 block we could find, for this reason. Course, this was back when a JY motor complete was 25-50 bucks.:eek1: :eek1:
     
  11. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    A 396 has a 4.094" bore so you would have to bore it .156" oversize to get a 427 and it isn't possible to overbore that block that far.

    396 = 4.094" bore / 3.76" stroke
    402 = 4.124" bore / 3.76" stroke
    427 = 4.250" bore / 3.76" stroke
    454 = 4.250" bore / 4.00" stroke
     

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