there are several different versions of the JDM ZC, all 1.6L and have ZC stamped on the block - there are SOHC non-VTEC, SOHC VTEC and DOHC and there are OBD0 and OBD1 versions - the SOHC and DOHC blocks are not the same - the only head that fits the DOHC ZC block is the DOHC head - the SOHC non-VTEC OBD0 ZC is basically the same as the USDM Si D16A6, but has a different camshaft - it is 118hp - if it was a fuel injected engine, the head casting itself is the same as the Si and DX - there are carbed SOHC ZCs which have a different head