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Thread: Maximum bore BBchevy

  1. #1

    Maximum bore BBchevy

    I would like to know the max. bore for a tall truck block.And if anyone knows a machine shop near Baltimore. I want to go 4.530.Thanks in advance JIM :?:

  2. #2
    Senior Member DYNO OPERATOR
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    Maximum bore

    427 truck block is good to 4.350" to 4.375" maybe. I would fill it to water pump holes for that big. But you can use a 4.375" stroke or possibly 4.500" stroke on tall deck to get maximum cubes, depending on rod length. This would take cubes from 505 to 540 range.

    It has to be a siamesed bore block to go above this size which is a Bowtie GM block or Dart, etc.

    Remember, a tall deck block and aftermarket heads create issues with headers fitting in any stock frame car.

    That being said, a tall deck or short deck 496 is just a small bore 540 and will do a very good imitation of one if the combo is correct.

  3. #3
    Senior Member DYNO OPERATOR
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    I tried that a few years ago on two blocks and there was not enough metal it bores through and we had to sleeve the block and go smaller stock blocks from what i have seen want go 4.500

  4. #4
    Senior Member DYNO OPERATOR
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    Re: Maximum bore BBchevy

    Quote Originally Posted by jamzilla
    I would like to know the max. bore for a tall truck block.And if anyone knows a machine shop near Baltimore. I want to go 4.530.Thanks in advance JIM :?:
    The largest bore I've seen in a stock block is 4.390 (.140 over). A friend of mine has it and it also has been hard blocked too.

    TS1955

  5. #5
    Junior Member SHOW GUEST
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    Many production blocks have thin cylinder walls, even at standard bore.

    I would go easy on the intended power level, (and in doing so... the cylinder pressure), If I was forced to overbore a stock block drastically.

  6. #6
    Junior Member SHOW GUEST
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    For a 4.500" bore, it's time for a Dart or World block.

  7. #7
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by ewing
    For a 4.500" bore, it's time for a Dart or World block.
    You are correct.

    TS1955

  8. #8
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by ewing
    For a 4.500" bore, it's time for a Dart or World block.

    Dart only !!!!
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  9. #9
    Senior Member SENIOR BUILDER
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    I wouldn't try the 4.5 stroke either, as you'll likely hit the oil gallery in the oil pan rail while trying to clearance it............Not sure if they made the truck blocks in the priority main style oiling system though......that would allow it to be opened up a bit..........
    Mark Goulette
    Owner/Driver of the Livin' the Dream dragster
    www.livinthedreamracing.com
    Speed kills, but it's better than going slow!!!!

  10. #10
    Senior Member RACING JUNKIE BEAST477's Avatar
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    Quote Originally Posted by hink
    Quote Originally Posted by ewing
    For a 4.500" bore, it's time for a Dart or World block.

    Dart only !!!!
    X2 on the Dart block :!:
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549


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