EW1 = 1488cc SOHC CVCC carb '84-'87 Civic/CRX (USDM)
EW2 = 1488cc SOHC non-CVCC SOHC EFI '84-'87 Civic/CRX (CDM)
EW3 = 1488cc SOHC non-CVCC SOHC EFI '85 CRX Si (USDM)
EW4 = 1488cc SOHC non-CVCC SOHC EFI '86 Civic/CRX Si (USDM)
EW5 = 1488cc SOHC CVCC EFI '84-'87 Civic/CRX (JDM) (I'm not 100% sure on this one)
EV1 = 1342cc SOHC CVCC carb '84 CRX, '84-'87 Civic