Dyno a 7.5:1 400? Sure, why not?

One of the things I've been wanting to experiment with are shims or pucks that can be attached to the piston head with taper head allen screws...positioned more or less the way gas ports are. The weight would be insignificant considering where in the assembly it is positioned, and it would open up a universe of possibilities as far as compression and more importantly quench is concerned. It sounds off the wall, but I can't see any reason why it would not work.