Compression being the biggest factor. Even between one rocket 265 kit and mine I would not correlate that too much since my head is decked a very healthy amount, bringing it into the 13.xx static ratio realm.
 
You are correct it was at 251 last year. When I changed injectors I put in the 9000 map, and figured I'd use Carpenters timing, assuming it would be optimal already. It made 237, adjusted the timing map to how it was last year and made 252.
So you changed the configuration from Carps kit, and didn't think you'd have to tweak the tune? :whitstling:
 
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