Will the stock 2000 Civic CX radiator be able to handle a b18c1?

 

It should unless you have major mods. Just for the safe side though, you might want to get a b-series radiator, dual core, all metal, bigger inlets and outlets. I just bought one for my hybrid. I got it at http://www.radiators.com, it is an OEM replacement for a 96 dohc vtec del sol. I got it for $135.00 shipped.