The key part of my build is to keep it a 230, not stroke or overbore it. Keeping it the same size. I have a lead and a plan slowly taking shape for a 292. I doubt a 230 would *need* bigger valves to run ok. Comparing it to a modified 292 makes no sense. That's a helluva lot bigger air pump with the same head on top. I'm comparing mine to what it was, a 230.