Crate Motor advice needed

[tomtom72]

Hi All, I have a question. Can anyone tell me what a ZZ3 motor is? I went to GM's restoration parts site and linked to the 'crate motor section' and I could not find anything on a ZZ3. Is it a superceeded motor, or do I have a typo and inaccurate information? Also, I would like anyone's opinion about where to find information about retrofitting electronic fuel injection to a GM crate motor? Thanks to all for any help. tt72

 

[mvftw]

I believe the ZZ4 took it's place...

 

[tomtom72]

Thank you mvftw. I would be correct in thinking that both are similar except for what ever improvements chevy may have added to the ZZ4? Thanks again!