• 1990 Camaro Parts Catalog

The 1990 model year was only a half year of production due to Chevrolet not renewing the IROC contract, no IROC-Z's were produced after. Instead, the 1991 Camaros were introduced early during last half of the 1990 model year.1990 IROC's and RS's are easily identifiable: 1990 was the first year for the updated interior which included drivers side airbag, redesigned instrument panel, yellow lettering on dash, rounded controls, etc. So 1990 Chevy Camaro IROC's are the only '90 Camaro IROC's with the new interior. 1990 RS's are the only RS's with the new interior and the older valances (before the new `scooped' side valances).The LB8 2.8 liter V-6 was replaced by an increased displacement 3.1 liter LH0 V-6.In 1990, the base engine for the IROC was finally the LB9 TPI 305 rather than the base LO3 V-8.

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However, G92 had to be specified now to get the better cam/230hp LB9 motor in the 5 speed LB9 IROC-Z. Previously, all 5 speed LB9 IROC-Z's got the higher output LB9. One other difference between a 1989 5.7 IROC and a 1990 5.7 IROC are the pistons.

1990 Camaro Parts Catalog

The 350 (only) received lighter weight pistons thus a slight horsepower increase of 240 (1989) to 245 (1990). In 1990, TPI Camaros switched from MAF air metering systems to MAP systems. This eliminated the mass airflow (MAF) sensor.IROC-Z convertible now came standard with 16 inch wheels and P245/50ZR-16 tires.G80 limited slip differential became standard equipment on IROC-Z.The Borg-Warner HD rear end was dropped and replaced with the old 7.625 (7 5/8) inch rear end. Because the Borg-Warner axles were no longer being used for the G92 option, optional axle ratios changed slightly: LB9 305 TPI 5 speed went from 3.45 (1989) to 3.42 (1990) and the B2L 350 TPI went from 3.27 (1989) to 3.23 (1990).