Hi, it is time to change the head gasket on my 2.5 turbo. I4m going to put the MP gasket. I4m taking the opportunity to lower the compression a little bit with the Fel Pro copper shim (future hi boost plans). I read it is a .020" shim, my first question considering the head does not need to be milled is: how much lower will the compression go? Second question is: what type of sealer do I need, and do I need it between the block and the shim or between the shim and the headgasket or both? My final question is: does the shim make the head gasket more prone for leaks? Any tips will be very appreciated. Mario Turbosmx.com
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