m20 valves

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  • zaq123
    E30 Fanatic
    • Jul 2016
    • 1386

    #1

    m20 valves

    Ok so my original built head is garbage, cracked. Supertech valves in it just got seated as the car had about 1k km when I noticed the crack. Valves have about 1k and have a noticeable line on the valve face where it was seated to the old head. Old head was fully rebuilt and valve seats were cut to 3 angles so obviously seats aren't exactly the same width etc as new head.

    I threw in those valves into new head and they are holding alcohol with no leaks. Do I reuse these valves or should gett a new set? I think it's pointless to lap valves here because the face of them is perfect and the contact line ( I assume it's the edge of the valve seat contact) will not be at the same spot once valve under the spring pressure.

  • zaq123
    E30 Fanatic
    • Jul 2016
    • 1386

    #2
    pics. valve with wider face is EX

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    • digger
      R3V Elite
      • Nov 2005
      • 5967

      #3
      these things are too hard to tell on pictures always looks worse than reality. Whatever donor you use will need work done by a cylinder head place and they can inspect and grind if required
      Last edited by digger; Yesterday, 06:25 PM.
      89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

      new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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