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Thread: Head seal- aluminum block

  1. #1
    Junior Member SHOW GUEST
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    Head seal- aluminum block

    Problems keeping seal on my big chief heads sealed to my donovan block, Tried copper with O rings and MLS gasgets but alwas seem to fail after about 50 passes. This is a N/A high 7 sec car. Are these blocks amaintanance piece? Any sugestions. Thanks. Motor is a 632ci.

  2. #2
    Administrator RACING JUNKIE bjuice's Avatar
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    I got the same set up with no issues...copper head gaskets o-ringed...NO LEAKS....did you use any sealer around the head studs ? have you tried Haylomar on your head gaskets.

    How bad is your leak ?...if the above don't stop it I would have to get the block decking checked out along with the heads the next teardown.

    jmo
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  3. #3
    Senior Member RACING JUNKIE
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    :?: Do you have reciever grooves in the heads, i know that O'rings donot work well with over .060 copper gaskets, and they have to be retorqued after 15 to 20 passes. I've ran KB blocks blown alcohol that's what i had to do, but i've never ran a Donovan blk.


    JMO

    Zip.

  4. #4
    Senior Member RACING JUNKIE
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    Geez, I thought "Re-torquing" heads on any aluminum engine /head combo was just weekly maintenance if you're running high compression and leaning on it.

    Currently, we re-torque the Darts on the cast iron BBC about every 30 runs . . Just one of those things you do (I think) . . .

  5. #5
    Administrator RACING JUNKIE bjuice's Avatar
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    Quote Originally Posted by roadkill2
    Geez, I thought "Re-torquing" heads on any aluminum engine /head combo was just weekly maintenance if you're running high compression and leaning on it.

    Currently, we re-torque the Darts on the cast iron BBC about every 30 runs . . Just one of those things you do (I think) . . .
    always a good practice...also what Zip said about receiver grooves in the heads...this will really cause the wire to bite into the copper headgasket !
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  6. #6
    Junior Member SHOW GUEST
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    Thanks for replies, block and heads have been resurfaced. took O rings out when re-sleaving it,the sleaves are machined flat with block. They were proud .002 with 0 rings. Im trying MLS gasket and re torqued after 1st cool down.Never triied Halomar and re-torque exta times. Hope this works. Any one else with the same combo would like to here from you Thanks Larry.


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