The fourth-era 4A-GE engine was developed from 1991 to 1995. It's silver cam covers with chrome lettering, hence the nickname "silver major". This engine another time capabilities a very new cylinder head which uses 5 valves per cylinder rather than 4. It works by using Toyota's Variable Valve Timing (VVT) https://4age-20v-turbo-engine-for24567.blogzag.com/83102048/the-toyota-4a-ge-diaries