I got a sheet of plexiglass a syringe, and a bottle of miracle oil. I had 0.070" cut and went from 61-62 cc to 48 CC. I also smoothed my chambers with a dremel so I lost a little bit there too. As mentioned earlier, you really just want to make sure your compression is up near the 9.0-9.2 range. I think I ended up in the 9.4 range with a NOS head gasket with a 0.035" thickness.