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    M20 Porting Question

    I know the general guideline is to not blindly attempt to port an 885 head, but I still have to ask. On the head I'm working on, on the short side of the ports, there's a corner where machined section meets the casting, and another where the seat meets the port. Would it be useful to round off these edges, or am I more likely to make things worse?

    #2
    If you simply radius them, you won't hurt anything. But you probably won't gain 10 bhp, either-

    That's what the red paint on the valve cover is for.

    t
    now, sometimes I just mess with people. It's more entertaining that way. george graves

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      #3
      Historically speaking, rounding off that edge is a nice touch. As Toby says, it's no red valve cover, but it's not a bad thing either.
      ADAMS Autosport

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        #4
        M20 Porting Question

        Don't mean to thread Jack but if you deck the head does that effect tdc and cam timing?
        Edited*

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        Last edited by E30DriftMissile; 08-15-2016, 05:53 PM.
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          #5
          Clarify what "tac timing" is and we might be able to help.

          Cam timing: Yes
          ADAMS Autosport

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            #6
            I decked my head and lightly shaved the block and at tdc I was really hard to turn the crank so I backed off


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              #7
              if the cam axis and crank axis change then yes the cam timing moves a bit. how much was it decked?
              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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