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Thread: machine shop scratched up my cylinder head???

  1. #1

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    machine shop scratched up my cylinder head???

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    WTF?? I brought my head to the machine shop to get the broken stud removed and they removed it fine. I look at the head surface and it's all scratched up by sandpaper. Why would this be something a machine shop would do? am i missing something? i thought i was supposed to avoid scratching up the surface!

  2. #2

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    It is called "resurface"....& will ensure that the gasket is seated correctly and compressed evenly. An even compression on the seal will help assure that it won't leak. But you are correct with your description.

  3. #3


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    If you are unsure of the work, you could always borrow a friends quality straight edge and check for warp. Surface is supposed to be a mirror like finish if using a mls gasket, and not required for using a basic felpro gasket.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  4. #4

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    I'll take a resurface job any day with all the head problems an aluminum head can have!

  5. #5



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    I'm guessing they dont have an expensive cnc machine or milling machine that is set up to do a resurface on heads, so they used the ol' fasioned flat table/piece of glass and sandpaper method. As long as its flat/straight it's all right.
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  6. #6

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    so i picked up my gasket at Mitsubishi and stopped by and showed them the gasket talked to them about it. He told me the head was flat as a pancake and he didn't think it was worth doing anything but a light sanding to remove burrs. OK, so i overreacted. He says it's good to go and sounds like you guys are not too worried so i'm going ahead with it.

    Thanks!

  7. #7

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    Kewl............................good luck. I still have to take mine to a machine shop to have checked.

    I've pulled the cam and valves out of mine.

    Gonna have it magnafluxed and checked for warpage.

    Hopefully mines ok too.
    ~~~~~~My toys~~~~
    1984 Dodge D-50 (Daily driver, when raining)
    1990 Mitsubishi Mighty Max (Trying to figure out no power and sputtering)
    2006 Harley Davidson Heritage Softail (Rider when it's not raining and cold)
    1975 Honda CB750K5 (Rider when it's not raining and warm)
    1974 Honda CB350F1 (In paint for tins)
    1972 Honda CB175K6 (Just a rolling chassis, no engine)
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    ~~~~~or headaches~~~~~

  8. #8



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    can't magnaflux an aluminum head they are die checked - that is for iron heads.
    Pennyman1
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  9. #9

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    oooops....well at least checked for cracks?????............thanks for the clarification.....
    ~~~~~~My toys~~~~
    1984 Dodge D-50 (Daily driver, when raining)
    1990 Mitsubishi Mighty Max (Trying to figure out no power and sputtering)
    2006 Harley Davidson Heritage Softail (Rider when it's not raining and cold)
    1975 Honda CB750K5 (Rider when it's not raining and warm)
    1974 Honda CB350F1 (In paint for tins)
    1972 Honda CB175K6 (Just a rolling chassis, no engine)
    1972 Honda CB100K2 (Needs an engine, and rebuilding) (shhhh...if wife knew I had this, she be pizzzed)
    ~~~~~or headaches~~~~~

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