Arp doesnt make headstuds for the zc ,most places dont even know what a zc is, but they do make 89 integra headstuds which are the same as the zc(in my case), many "how to" websites that give zc info say the the arp headstuds for VW will fit the zc, i bought them and the machine shop said they dont fit, he phoned arp and gave the sizes and got the right ones, im not sure if different zc,s have different headstuds, your best bet would be to get the machine shop to measure the headstuds and phone arp so u dont buy ones that dont fit,( if anyone needs some VW headstuds, i have some new ones really cheap!), with the rod bearing just bring them to your local honda dealer , if he doesnt have them he,ll know where to get them from, with sleeves if your not boosting past 12pounds you probably wont need them but if you have the $(they are pretty pricey) then Golden eagle can make a set for the zc, or you can try darton, im not sure if they do the zc, a block guard goes on the top of your sleeve to prevent it from splitting or cracking under boost or if you have detonation, the only problem is is it supposedly prevents proper cooling to the top of the cylinder. What compression are your pistons ? if your NA you dont want them too low say like 9.1,and you dont want it to high if your going turbo( 10.5.1) i got mine done at 9.5.1 as i was NA then went to turbo, but the most important thing if going turbo is proper tuning