what alternator do i need for a chevy nova with a 230
Don't understand your question.
What alternator came with it, and what's wrong with that one?
http://www.1aauto.com/1A/alternator/Chevy/Nova/1AEAL00047/321298That example is an external,more accuarate charging,more reliable,easy to convert to external.
Depends on what year Nova
Internal regulator,exteternal?
MBHD