 1990 was a distinguishable model year as it was the only third generation Camaro that didn't feature the updated ground effects of the 1991–1992 models but did have the newer interior/dash features.The 2.8 L V6 was upgraded to the 3.1 L V6.The RPO code 1LE was again available in 1990, triggered as in the previous year by RPO G92 Performance Axle combined with no air conditioning on the IROC-Z coupe.