M20B25 Valve seat recut

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  • zaq123
    E30 Fanatic
    • Jul 2016
    • 1364
    #1

    M20B25 Valve seat recut

    Can anyone please tell me what angles should I have the shop to recut my EX and IN valve seats in the prep for my new valves? Should I back cut new valves for the better flow as well? three angle cut? four angle cut?
    Thank you in advance
    Tags: None
    • jeffnhiscars
      R3V OG
      • Jun 2011
      • 6010
      #2
      I do a 3 angle seat and a back cut
      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

      https://www.r3vlimited.com/board/sho...86#post4944786
      Alice the Time Capsule
      http://www.r3vlimited.com/board/showthread.php?t=360504
      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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        • zaq123
          E30 Fanatic
          • Jul 2016
          • 1364
          #3
          Originally posted by jeffnhiscars
          I do a 3 angle seat and a back cut
          What angles do you guys recommend? IN EX? 15 46 75 for IN? EX??
          Thank you

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