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Thread: 400 block question?

  1. #1

    400 block question?

    I baught a 400 engine casting number 3951509 that is punched .060 over is this safe for a dirt modified? Let me know what you think.

  2. #2
    Senior Member RACING JUNKIE fla1976's Avatar
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    One way to know is to have it sonic tested.

  3. #3
    what is sonic tested and where can it be done at

  4. #4
    Senior Member DYNO OPERATOR
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    509 BLOCK I THINK IS THE WEAKEST OF THE FACTORY 400 BLOCKS.
    BECAUSE OF THE 4 BOLT BEARING CAPS.

  5. #5
    Junior Member SHOW GUEST
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    Sonic Testing

    Here is a brief article explaining what Sonic Testing is.

    http://racingarticles.com/article_racing-73.html

  6. #6
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by fla1976
    One way to know is to have it sonic tested.
    X2!!!!!!!!!!!! and at the bore on a 400 block there is a good chance of cracking from the head bolt hole to the cylinder.

    Look it over close
    WWW.CNCBLOCKSNE.COM
    IS A DIVISION OF
    HINKSON AUTOMOTIVE
    RESEARCH & DEVELOPMENT

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    EMAIL CHINKSON@JUNO.COM

  7. #7
    Senior Member SENIOR BUILDER
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    Quote Originally Posted by JEFF69Z28
    509 BLOCK I THINK IS THE WEAKEST OF THE FACTORY 400 BLOCKS.
    BECAUSE OF THE 4 BOLT BEARING CAPS.
    not all 509s are 4 bolt

  8. #8
    i heard that that some shops drill the steam holes, thread them and plug them,to prevent cracking in this area, for drag race use. any experiences with this? i believe that a 509 block is one of the stronger 400 blocks. i have one in my garage now that is a two bolt block that has been studded,line bored, and filled to the bottom of the frost plugs.

  9. #9
    Senior Member DYNO OPERATOR
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    400

    To see what is required to add life to the head deck of a 400, you may want to check out the old Bill Jenkins smallblock chevy engine building book.

    It details how to drill, tap, and plug the steam holes. It also shows to add plugs with holes in them to the big water holes in the deck and mods to other water holes.

    I followed this once and the 400 block lived 7 full seasons of drag racing. It eventually cracked from a head bolt hole to the bore. Rest in Peace.

  10. #10
    mark, were you using studs,or bolts in the decks of that block?


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