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Thread: how big of bore gen 5 bbc

  1. #1

    how big of bore gen 5 bbc

    I have a bbc marine, gen 5, 4 bolt block. Going to freshen. Thinking about a new rotating assembly. How big can you bore this block and still be reliable. It's a bracket/index motor. Dont want to fill block.

  2. #2
    Member MASTER JOURNEYMAN
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    454 or 502?

  3. #3
    Senior Member RACING JUNKIE
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    If you're worried about reliability, don't go more than .060 over. Put a 4-1/4" crank in it and be done.
    -WJ Birmingham

    OneBadGMC.com

  4. #4
    Senior Member EXPERT BUILDER
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    A soinic test would be the way to go!!!!!!
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  5. #5

    454

    it is a 454 block

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by OneBadGMC
    If you're worried about reliability, don't go more than .060 over. Put a 4-1/4" crank in it and be done.
    DITTO!
    ***IN GOD WE TRUST***

  7. #7
    Senior Member DYNO OPERATOR
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    Re: how big of bore gen 5 bbc

    Quote Originally Posted by randybryan
    I have a bbc marine, gen 5, 4 bolt block. Going to freshen. Thinking about a new rotating assembly. How big can you bore this block and still be reliable. It's a bracket/index motor. Dont want to fill block.
    I have been using a bow tie gen v block bored to 4.600 using 15 to one comp. and have no grout in the block. The GM max recomended bore for this block is 4.6". Grout is for bone stock blocks with core shift. A new aftermarket block is cheep insurance for block quality. You'll have more in machine work and gimicks to get the durability of a good block than a good block costs. You decide

  8. Racing Junk


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