11 to 1 seems high unless it is a drag motor. 64 CC chambers will rate you around 9 to 1. Cam dosen't give you compression, your pistion cc along with the head chamber size does that. The cam I guess in a way could work with compression as hot cams bleed off compression so you need a high compression ratio for them to work right ( so they maintain a safe compression ratio, otherwise, stalling at idle could occour and so on ). We do need to know what the engine will be used for, this will assist with cam decision, but the bottom line with that is, only run a hot cam on the track, run mild cams on the street/ strip situations. and as a baseline for the hot cam would in fact be at least a 11 to 1 or 12 to i engine min where as a mild cam, probably 9 or 10 to 1 baseline. And if running a blower, 8 to 1 static compression is probably the best.