I am using the 1.6mm spacer with two gasket for the 3mm stroker. The problem I ran into was the chain was so tight and I couldn't get the cam to sit in the head. I called three machine shops and was referred to the one I just called and was turned down with cant help you. I asked one shop if they can machine my gy6 head and he said GY WHAT?
So I saw on youtube how to mill you head, used 320 wet sand paper on the granite counter top or a thick piece of glass. I measured the head thickness and started to sand away with water and dish soap to get .015 off the head. I had to measure it often and spin the head in figure 8s to get even cut. It took about 1 1/2 hours or more of sanding and about 5 sheets of paper. I finished it with 600 wet grit for smooth surface.
After this the cam sat flat and the chain had a little slack in it. You need to apply more pressure on the thicker part of the head to get a even cut, and measure often to keep the head square.
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