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  1. #1

    Join Date
    Jun 2012
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    Fairfax, va
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    37

    gpr milled head spec

    i had group k mill my stock head does anyone know approx. how much material was removed. trying to reused stock head bolts and adding washers. need to know how much to add. I have 8mm stainless flat washers that are approx. 0.060" inch thick. adding one to each bolt. I think it will work but would like to ask and double check.


  2. #2

    Join Date
    Aug 2006
    Location
    Indiana
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    1,274
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    81
    You do not need to add washers to head bolts, there is plenty of threads left for a GK cut. You will need to put washers under the front exhaust mount, then those 2 head bolts go in. You also need to put washers under the side exhaust mounts. Any stainless washer in the .055-.070 range will work. One washer to each one.

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