ORIGINAL: liquid_TR
If i remember correctly; For high nitro applications you need to lower the compression (thin gasket) to avoid detonation, and for low nitro app. use the original or thicker gasket to raise compression.
When you change gasket thickness or numbers, you actually change the compression ratio. If you increase the gasket thickness, you increase the area in the combustion chamber and that lowers the compression ratio. And if you remove them, you're increasing the compression ratio. Hard to keep it straight.