The third-generation appeared in 1988 and was in production until 1992. This engine has the silver cam covers with the words only written in red, hence the nickname "red top". Toyota increased the compression ratio from 9.4:1 to 10.3:1. To correct the air-speed problems of the earlier generations, the intake ports in this cylinder head were re-designed to have a smaller cross-section, and hence it has been nicknamed the "smallport" head. This change in the intake ports negated the need for the earlier twin-runner intake manifold and it was replaced with a single-runner manifold. Additional engine modifications to extend life and reliability included under-piston cooling oil squirters, thicker connecting rods and other components. Also of note, the pistons were changed to accept a fully floating gudgeon pin unlike the pressed-in pins of the earlier versions. Other internal revisions were made to the pistons. They were slightly modified to make space for the under-piston cooling oil squirters found in this engine version. In addition to this, the piston ring size were changed to (top ring), 1.5mm (second ring) and (oil ring), this change in size made it difficult to obtain as compared to the earlier 16 valves versions of the 4AGE (top ring), (second ring), (oil ring). All non-U.S. market 4A-GEs continued to use a MAP sensor, while all of the U.S.-market 4A-GE engines came with a MAF sensor. For US-market cars this revision increased the power to at 7200 rpm with a torque of at 4800 rpm ( and Non US-Market versions (MAP Sensored) Make 8-10hp more at the crank