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Technical SBC wear?

Discussion in 'The Hokey Ass Message Board' started by Fry, Jul 24, 2019.

  1. Had a rocker stud pull and I’m going to get my heads machined for screw in studs.
    Pulled the heads and thought the cylinders were shined up more than I thought they should.
    It’s a mild 327, fully rebuilt 2500 miles ago.
    Is this normal wear?
    The diesels I work on for a living would still have like new cross hatch after 2-3000 hours. But I’m not experienced with older gas engines, I just expected it to look new still.
    It’s hard to get a good picture so hopefully good enough
    . 42400D20-3D79-4621-A7C1-85908DCFA13A.jpeg C2362A8A-A344-41CF-AA97-5F9AFFFF1DDE.jpeg AAD4AD29-ACC7-48BF-8A55-0119C6141852.jpeg 6B96B9BA-132D-4771-8AF0-0E5B390F913E.jpeg

    Attached Files:

    loudbang likes this.
  2. Was the cross-hatching evident when you got it back from the re-builder or was it completely re-assembled when you got it back?
    loudbang likes this.
  3. crossthread
    Joined: Mar 9, 2006
    Posts: 103


    I have seen that when block was not cleaned well enough after shop work . Grit from honing and /or molly rings . Might want to pull pistons and crank and ball hone clean and put back together
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  4. squirrel
    Joined: Sep 23, 2004
    Posts: 43,464


    I would not worry about looks way too normal to me.
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  5. Thanks Squirrel. Just wanted reassurance.
    lothiandon1940 and loudbang like this.
  6. Truckdoctor Andy
    Joined: Jan 13, 2017
    Posts: 865

    Truckdoctor Andy

    Don’t worry, it will be fine. I still see cross-hatching. The diesels that you and I work on have different piston ring packages and have to withstand a lot more heavy use than car engines. I would also guess that our cylinder liners have a higher nickel content in the iron.

    Sent from my iPhone using The H.A.M.B. mobile app
    loudbang and 427 sleeper like this.
  7. big duece
    Joined: Jul 28, 2008
    Posts: 5,598

    big duece
    from kansas

    Which rings are you using, and oil?
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  8. I agree that it looks normal, sometimes we make this old car stuff way to complicated

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  9. Blues4U
    Joined: Oct 1, 2015
    Posts: 3,818

    from So Cal

    I'd say that is a LOT of wear for 2500 miles, should not be typical. Polishing like that is usually the result of carbon deposits in and around the ring grooves and lands, restricting free movement of the rings in the grooves, and that usually takes a lot more than 2500 miles.
  10. deathrowdave
    Joined: May 27, 2014
    Posts: 1,787

    from NKy

    I think it will be fine . My feelings are this is a product of over carbing , fuel wash .
  11. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 381

    from 94577

    Doesn't look bad.
    Fingernail test it.
    If those 'score' marks are more prominent than the cross hatch you might want to verify clearances.
    Otherwise its most likely just an artifact being it is on the thrust surfaces and not anywhere else on the bore. Albeit if you look at the cylinders perpendicular you will see similar marks on the sidewalls.
    Look for any polished smooth areas, that would be more indicative of wash down.
  12. X-cpe
    Joined: Mar 9, 2018
    Posts: 691


    In a lot of places in those pictures it appears to me that the cross hatch marks go over the vertical scuff marks.

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