The fourth-technology 4A-GE engine was produced from 1991 to 1995. It has silver cam covers with chrome lettering, hence the nickname "silver best". This engine once more functions a completely new cylinder head which uses 5 valves for each cylinder in place of four. It uses Toyota's Variable Valve Timing https://cruzrzfkm.wizzardsblog.com/39752184/rumored-buzz-on-toyota-4age-for-sale