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Thread: welding up a 400

  1. #1

    welding up a 400

    ok so i ran my 400 lean and ended up with about a 1/8 to 1/4 deep groove between the #3 and #5 cylinder on the block and head.Many people have been telling me i can have this welded and it will be fine.It is bored 40 over already so more boring after welding is not a option.Is it possible to sleeve a siemese bore engine?

  2. #2
    Senior Member EXPERT BUILDER
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    Sleeving a 400 blocks is not a good idea as we have seen them crack from the bolt hole to the cylinder many times cause a 400 has thin decks and thin cylinders plus you will distort the cylinders on each side of the sleeve.

    http://speedtalk.com/forum/viewtopic...ing+400+blocks
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  3. #3
    Senior Member RACING JUNKIE fla1976's Avatar
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    Would it work better if the block were half filled? Seems that the block would be more stable.

  4. #4
    Senior Member DYNO OPERATOR
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    Welding

    Do the right thing. Thank your block for it's service, give it a good burial, and go get another one. Don't be tempted to try and save it when you know better.

    If you machine another stock block, you may have enough invested in 2 stock blocks to own one good aftermarket block.

    An SHP Dart would be a good investment over the next few racing seasons.

  5. #5
    Senior Member EXPERT BUILDER
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    I also strongly agree with Mark.
    I was going to reccomend the SHP block last week but before posting rememered that SHP only comes in 350 main journals.
    If you already have a 400 block and ratating assembly you have the large journal mains, so you would have to start all over again with a new crank to fit the SHP and rebalancing your rotating assembly.
    For all that, I would just step up to the Little M Dart block with 400 mains, and you will have an awesome block to build on for many years to come (that is if you don't put windows in it...?)
    Yes, it is a few more dollars now, but will save you a lot in the long run and you will have a brand new block of new design rather than a 30 year old block on its last leg...
    I'm not hatin... I'm just sayin...

  6. #6
    Senior Member RACING JUNKIE
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    X2....would be money well spent.

  7. #7
    only thing is money!!!! I can get a stock block for around $3-400. Dart blocks are $2300

  8. #8
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by elephantrider1
    only thing is money!!!! I can get a stock block for around $3-400. Dart blocks are $2300

    A Dart SHP block all machined is 1795.00
    WWW.CNCBLOCKSNE.COM
    IS A DIVISION OF
    HINKSON AUTOMOTIVE
    RESEARCH & DEVELOPMENT

    CARL HINKSON 207-892-7215
    EMAIL [email protected]

  9. #9
    Senior Member MASTER BUILDER
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    welded deck

    I welded a 350 block between the cyl and decked it and put 700 passes on it as a 385 before the crank broke and I buried it then . used a high nickel rod .Later J.Smith 4621 racing

  10. #10
    Senior Member MASTER BUILDER
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    welded block

    The oil pan you see in my pic is unded that block. Later J.Smith 4621 racing

  11. Racing Junk


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