Empera has just gone through the shopping of HG's very recently & bet he did a good job shopping around & figuring out how available they are from different places.
.018" is how you state it heheh
I was wondering what in the world you were talking about.
I just made the following post but here it is as it has the same info you may need:
If you really want to know for certain what compression you will have before & after you can use this calculator
http://www.angelfire.com/fl/procrastination/motor.html
You will have to find out exactly what your piston's dome dish volume would be first though.
According to my machinist, the .020" I need taken off would not really change compression but would affect timing more.
Thanks to this link
http://www.worldwidemetric.com/metcal.htm, I can easily tell you that if your machinists took a total (both head & block) of .0315" off, a 2.0mm gasket would give you the same identical compression.
Anyone know what the GTE's piston dome dish volume is?
I have been wondering about that.