I didn't say 11:1 now, with the right cam that can be bumped up to 10.25, & still use pump fuel. The Port-o-sonic was the best single plane to race per Mopar back when, but the ports may be a tad small for 422 cubes, I'd like to see what a spacer does for him. If it were a 400 B engine, nobody would question a ~2.8sq.in. CA port runner, not sure what the max on a Offy Porto is.