what size
 

the size may be a 1.6 your block is prob a d16 y7 if its non vtec or a
d16y8 if it has vtec, if its a si your block may be a b series which
is a dohc vtec.if you look on your timing belt cover there should be a
sticker there saying what it is. go to a web site called clubcivic.com
you can find out alot about your year of civic. hope this helps