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For 1985+, Chevrolet introduced the IROC-Z version that was named after the International Race of Champions. Offered as an option package on the Z28, the Camaro IROC-Z featured an upgraded suspension, lowered ride height, specially valved Delco-Bilstein shocks, larger diameter sway bars, a steering/frame brace known as the "wonder bar", a special decal package, and an optional Tuned Port Injection system taken from the Chevrolet Corvette. It also shared the Corvette's Goodyear "Gatorback" unidirectional tires in a 245/50/VR16 size vs. the Corvette's 255/50/VR16 size, and received unique new aluminum 5-spoke 16-by-8-inch wheels. The new wheels were designed with different offsets front and rear, resulting in the words "Front" or "Rear" cast into the wheels to distinguish which wheel went where.
The Camaro IROC-Z was on Car and Driver magazine's Ten Best list for 1985. The 305 c.i. 5.0-liter TPI LB9 was rated at 215 hp (160 kW), with the 4-bbl 305 LG4 at 155 hp, and the 4-bbl High Output 305 L69 at 190 hp (142 kW). A total of 2,497 L69 IROC-Z models were made for 1985. The LB9 was available only on the Z28 and the IROC-Z model with the TH700-R4 automatic transmission. A total of 205 IROC-Zs equipped with the LB9 305 with the G92 (Performance Axle Ratio) option were made in 1985. The G92 option upgraded the rear axle gear ratio from 3.23 to 3.42.
Also new for 1985+, all Camaros featured refreshed noses, and new deeper valances and front spoiler for the Z28 and the newly introduced IROC-Z. The speedometers no longer had the unique double-pointed needle that simultaneously read mph and km/h: they were replaced by conventional single-pointer 85 mph (137 km/h) units.
For 1985+ a (1C5) RPO California IROC-Z was also made, Chevrolet's California Marketing Group came up with the idea and it was for sale in California only. A total of 250 black and 250 red examples were produced. They were all equipped with the 5.0 TPI LB9 engine and TH700-R4 automatic transmission. All came equipped with the IROC-Z fog lights, wheels and ground effects, but with the base Camaro's hood (no louvers), rear decklid (no spoiler), and no exterior decals.
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For 1985+, Chevrolet introduced the IROC-Z version that was named after the International Race of Champions. Offered as an option package on the Z28, the Camaro IROC-Z featured an upgraded suspension, lowered ride height, specially valved Delco-Bilstein shocks, larger diameter sway bars, a steering/frame brace known as the "wonder bar", a special decal package, and an optional Tuned Port Injection system taken from the Chevrolet Corvette. It also shared the Corvette's Goodyear "Gatorback" unidirectional tires in a 245/50/VR16 size vs. the Corvette's 255/50/VR16 size, and received unique new aluminum 5-spoke 16-by-8-inch wheels. The new wheels were designed with different offsets front and rear, resulting in the words "Front" or "Rear" cast into the wheels to distinguish which wheel went where.
The Camaro IROC-Z was on Car and Driver magazine's Ten Best list for 1985. The 305 c.i. 5.0-liter TPI LB9 was rated at 215 hp (160 kW), with the 4-bbl 305 LG4 at 155 hp, and the 4-bbl High Output 305 L69 at 190 hp (142 kW). A total of 2,497 L69 IROC-Z models were made for 1985. The LB9 was available only on the Z28 and the IROC-Z model with the TH700-R4 automatic transmission. A total of 205 IROC-Zs equipped with the LB9 305 with the G92 (Performance Axle Ratio) option were made in 1985. The G92 option upgraded the rear axle gear ratio from 3.23 to 3.42.
Also new for 1985+, all Camaros featured refreshed noses, and new deeper valances and front spoiler for the Z28 and the newly introduced IROC-Z. The speedometers no longer had the unique double-pointed needle that simultaneously read mph and km/h: they were replaced by conventional single-pointer 85 mph (137 km/h) units.
For 1985+ a (1C5) RPO California IROC-Z was also made, Chevrolet's California Marketing Group came up with the idea and it was for sale in California only. A total of 250 black and 250 red examples were produced. They were all equipped with the 5.0 TPI LB9 engine and TH700-R4 automatic transmission. All came equipped with the IROC-Z fog lights, wheels and ground effects, but with the base Camaro's hood (no louvers), rear decklid (no spoiler), and no exterior decals.
