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Big blocks

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by '73 K5, Dec 9, 2001.

  1. '73 K5

    '73 K5 1/2 ton status

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    What is the most you can overbore a big block. This guy I know was saying .125
    I'm used to seeing numbers like .030 and .060 for small blocks. Can big blocks really tolerate that much bore?

    '73 K5
    Chevy good...Ford bad
     
  2. wayne

    wayne 3/4 ton status

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    A 396 can but I don't know about a 454. Also I would not recommend it for street use with that much overbore.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. four_by_ken

    four_by_ken 1/2 ton status

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    I know of a block bored .080 over and I wouldnt go more than that myself.

    Ken H.


    '86 K5 up and coming
    14 bolt(Detroited),10 bolt,39.5 Boggers rear,
    TSLs front, 468 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  4. prjt_blzr

    prjt_blzr 1/2 ton status

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    BBC can be overbored about .125 for RACE use. Do not do this for street use. I would personnally stick to .060 as a max overbore on a street motor.
     

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