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Thread: Hair line crack in SBC block

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    May 2003
    Moscow Mills, Mo.

    Hair line crack in SBC block

    Anybody have any suggestions on repairing a hair line crack in a block when it's in the car. Looks like the crack is on the passenger side 1 inch to the right and left of the 1/8 pipe thread drain plug on the passenger side on a SBC motor.
    I drained the block, blew air in the radiator to help dry the area and get all the anti freeze and water out, brake kleened the area, peened on both sides of the crack to help stop it from cracking more, wire wheeled the crack then ground the crack to help when I put JB weld on it. I'm letting it dry with a drop light on it for 15 hrs.

    Anybody have a different way or do you think this will work? Oh, I also will fill it with water and aluma seal then run a 5# radiator cap.
    Thanks for your help.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Vince if you reach it easy you can weld it with NI-ROD, just V it out preheat it with a torch and weld about 1/2" at a time, if it's just a tempary fix i'd run the block sealer.
    The 400 blk 377", that i have in my Malibu has a 4" crack 3/4" below the deck on the passeneger side. It wasn't caught during the build, the blk wasn't decked. I v'ed it out and Tig welded it without pulling the heads. I'd weld about 1/2" and pean it too relieve the stress then weld another 1/2" with NI-ROD. It has over 200 passes on it and running a 16# cap. Course when i pull it apart next time ill change the blk. out. This was done as quick fix and it's been running for about 5 yrs.


  3. #3
    Senior Member RACING JUNKIE oldandtired's Avatar
    Join Date
    Dec 2008
    Sugar Hill, GA
    x2 on the high nickle rod. I've done it before. Dave
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

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  5. #5
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
    Join Date
    Mar 2008
    Emmett, Idaho
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