You have B18A's, B18B's, USDM B20B's (8.8:1 comp), USDM B20Z's(9.6:1 comp), JDM B20B's (8.8:1, 9.2:1, and 9.6:1 comp). The high compression JDM and the B20Z definitely have a little better cams than the lower compression ones and the B18's, but I think that most of the rest of them are all about the same.

Here is a ton of useful info on the B20:
http://www.tuneruniversity.com/forum...ead.php?t=1900