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I am sure I read somewhere about the importance of 'squish'. Basically you want as much of the mixture as possible squashed into the chamber as possible and not sitting around in the remaining disc shaped area above the piston where it does not burn very well. When you fit dished pistons, or thick gaskets or skim material off flat-top pistons you are decreasing (or increasing) the squish area and the resulting engine may not run so well. That being so, the best method of lowering the CR must be to change or modify the heads which may be easier said than done. I'm sure someone can fill us in about this issue... I may be talking complete bollocks!
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Cheers
Myles D-W
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