I know this is probably a really dumb question, but I have a question about the combustion chamber on my heads. I have a set of MMR stage 2 cnc ported PI heads. I am in the process of trying to get a set of pistons for my supercharged build, and when I looked up the CR of the PI heads, it lists the chamber size as "43.9 /- 1.5 cc combustion chamber"....I guess my question is, I have always seen a single number for combustion chamber sizes, so, what does the "- 1.5 cc " mean? Does that mean the chamber size is really 42.4cc. or does it mean something else?
Dumbe question about PI head combustion chamber
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