Although this has gone supurbly off topic...

DIFFERENCES BETWEEN A B20 AND B18

B20Z and B18B cams are the same! Exact same.
B20B intake cam has a little less lift then B20Z/B18B.

None of the B20s have oil squirters...neither do B18Bs
None of the B20s have block girdles...neither do B18Bs.

The B20B does NOT have a compression of 8.8:1...the compression is 9.2:1
The B20Z has a compression of 9.6:1

B20B/Z uses a GSR(P72) oil pump...B18B uses a B18B(P75) oil pump.

B20Z has a knock sensor...B20B/B18B does not.

B20B/Z does not have "sleeves" like teh B18B/C.
The "sleeves" are all one piece made of some fiber reinforced stuff.
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The info on the page is old, but apears valid.

Source: http://home.earthlink.net/~pritos/civic/info/info.html