The fourth-era 4A-GE engine was developed from 1991 to 1995. It has silver cam covers with chrome lettering, hence the nickname "silver major". This engine another time functions a completely new cylinder head which uses 5 valves for each cylinder rather than 4. It works by using Toyota's Variable Valve https://josueqizrg.kylieblog.com/40303190/top-guidelines-of-jdm-toyota-4a-ge