Ok. I was originally going to buy a DOHC ZC engine for about $600. It was gonna be used and with about 35,000 miles on it. Well...I went to my local import shop Kamikaze Racing and I asked the guy if it was a good idea. He said you shouldn't buy an engine for that cheap. You never know if there is a cracked piston or a blown head gasket, etc etc. So then I thought, "well that sounds good, maybe I won't do that." But I have a 1991 Civic DX Hatchback and that thing is sorry. Yeah it runs well but there is like no power at all. 92 horepower just isn't gonna cut it when that's not even what I'm getting to the wheels. I mean, I don't need a B16 b/c I'm not going to go down to the track very often. I just need something to give me more power and I felt the ZC would be a good alternative. I was thinking of maybe buying a rebuilt ZC off of one of those sites like rebuiltengines.com or something. But I'm not sure. Someone tell me if I should just buy a used one and hope it wasn't driven hard and nothin's wrong with it or should I pay that extra cash for a rebuilt. Tell me your experiences and where you got your swaps. Thanks for the help. It's really needed.