I've just recently found a '89 Civic SI Hatchback with a ZC swapped into it. The thing is, I'm confused... Is a SOHC ZC the same as a D16A6, just with a differant head? Or is it an entirely differant block? If it is a differant block, can I swap the SOHC head with a DOHC head? I read the write up on the ZC series info, but it wasn't clear to me which generations were SOHC/DOHC, or are they all? :unsure: My end goal is to have a DOHC ZC, and I'm trying to understand what all this car currently has.