MP 292H cam too big?

Yeah. It's pretty big. 248.5* @.050 on a 108 LSA. It's a cylinder pressure bleeder for sure.....but they are good cams if you have a matching build. I'd say 10-10.5 compression with iron heads would be fine on pump gas.

Also....a dynamic CR of 9.2....I think you're figuring something wrong somewhere. That's REAL high. I would double and triple check those numbers.