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The question is kinda wrong to start with.


I'll rephrase it for you. Closed-chamber head (Indy SR) used with flat-top pistons and 11.0 compression ratio. Mill heads to reduce volume by 10 cc and swap to pistons with dish that mirrors the combustion chamber and adds 10 cc to volume (no change to quench area or piston to head clearance). Same CR, but now part of the total chamber volume is in the dish. Is there an advantage to either approach?