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Thread: ? Maximum Bore 454 Bow Tie Block

  1. #1
    Senior Member RACING JUNKIE
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    ? Maximum Bore 454 Bow Tie Block

    I have a Mark IV Bowtie Block 454 Hy Per Series 9.8000 Deck
    Numbers on Block are:10051107
    4 Bolt Main
    9.800 Deck Height
    Siamesed Cylinders,

    Anyone know what the Max Bore Size is on this block.

  2. #2
    Senior Member EXPERT BUILDER
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    GM Performance Parts books say 4.500"
    If a 5 lb hammer can't fix it,it must be electrical
    Keep the shiney side up! 8)
    http://www.racingjunk.com/profile/85221

  3. #3
    Senior Member SENIOR BUILDER
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    I had one that I bored to 4.600. Thinest cylinder wall after sonic check was .385". 4.625" is max safe.

    Mark

  4. #4
    Senior Member RACING JUNKIE
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    Have on thats 4.625 thats limit
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  5. #5
    Senior Member DYNO OPERATOR
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    I don't think i would even try to take it out that far i had one and we bored it out to 4.460 and went thru on one cyld. and the four corners went to 4.500 .
    so we went back sleeved them and i got another set of pistons and redone it .

  6. #6
    Senior Member RACING JUNKIE
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    Wow I think I'd sell it and get a Big M or Merlin that is already 4.5 then you have room for some rebuilds. JMO

  7. #7
    Member JUNIOR BUILDER
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    you will be taking away the shelf life of that sbc if you go boring it to the max.If I were you if you want big inches,go big block.FISHMANJOE

  8. #8
    Senior Member RACING JUNKIE
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    hmm a bit confused a gm bowtie block is used as much as dart/merlin around here for 540 + builds and tall decks are very common to use for 632s for ts/td guys. The block is good and less money then a dart.

  9. #9
    Senior Member RACING JUNKIE
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    Nevermind I misread the post. ops:

  10. #10
    Senior Member MASTER BUILDER
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    I have the same block and casting number, but mine started as a 502 and now it is a 540. How much hp can these Bowtie blocks handle?


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