We regularly rebuild or modify combustion chambers on the CNC. We have digitized numerous head mods through the years. I will have the guys go back through the files and see if we may have something already to go and if it is available. There are many factors which need to be considered when "opening" or increasing the combustion chamber volume. The good news is that it is not VooDoo magic!! On a personal note, I fly cut a 1 1/2" diameter, tapering sphere that was .050" to .0010" in the pistons for my GTO. I wanted to run crappy, ethanol pump gas. Changed my static compression from 10.5:1 to 8.65:1 using the 68cc chambered "correct" heads. This can all be done!!
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