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Thread: Chevy 400
          
   
   

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  1. #1
    speedemon's Avatar
    speedemon is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 32 Roadster
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    Chevy 400

     



    Hi

    I`ve got a mate with a 400 chevy with a weiland 6/71 blower on it , just had the bottom end rebult and low comprssion piston fitted , but it keeps blowing head gaskets , then at the weekend at a drag meeting did them again when we stripped it out found 3 of the studs into the block were cracked into the bores, is this a common fault or to do with the blower
    He has been told to O ring the new block next time instead of head gaskets
    is theis a good idea ??

    Craig
    Speedy speedemon

  2. #2
    BigRedTrucker is offline CHR Member Visit my Photo Gallery
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    I assume there's steam holes drilled?

  3. #3
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '32 Henway
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    There are, in my opinion, several things that will cause blown gaskets on a supercharged motor, the deck and/or heads are not parallel, running too much boost for the gasket used and letting the motor run in detonation. You'll have to determine what's happening to fix it. If the motor has been detonating, it's gonna pound the bearings out of it, bend some rods and maybe break some pistons too.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  4. #4
    TyphoonZR's Avatar
    TyphoonZR is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 86 S-15 Jimmy sb 400
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    Quote Originally Posted by speedemon
    Hi

    I`ve got a mate with a 400 chevy with a weiland 6/71 blower on it , just had the bottom end rebult and low comprssion piston fitted , but it keeps blowing head gaskets , then at the weekend at a drag meeting did them again when we stripped it out found 3 of the studs into the block were cracked into the bores, is this a common fault or to do with the blower
    He has been told to O ring the new block next time instead of head gaskets
    is theis a good idea ??

    Craig
    I run 400s and I have never had a stud crack into the bores. My guess is that you will need a new block. As for gaskets, tell your buddy to try Cometic gaskets. They can be ordered any thickness and can be reused numerous times. They are even better than o-ringing the block or head.
    Objects in my rear view mirror are a good thing unless,.... they have red and blue lights flashing.

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