Originally posted by inspyral
You're not going to be able to run stock B20 pistons, sicne they don't have the valve reliefs for VTEC valves. You'll need some 84mm VTEC pistons. That'll add about $400 to your cost.
Not *NEEDED* but it's a good safety margin. The B20 pistons have valve reliefs size for non-VTEC valves. It's not a major problem with 1stgen b16a cams, since they have a bit less lift/duration than the other VTEC cams. I'd worry if you have ITR or aftermarket cams. Also, don't dick with the cam timing. You can always clay your engine just to be sure.
The B20 bottom-end uses the same rod bolts and the LS', and the LS' use rod bolts that suck. ARP's are your friend.