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IROC was an option for Camaro Z28's back from about 1987 - 1990. Back in those days there were like four different engine options on a Z28. Base was a 195-200 HP 305 V8, there was also a HO 220-225 HP 305 V8. Then there was the option for a 245 HP 350 V8 - which you could only get in an automatic. There were both 350 & 305 IROC's made back in those years.
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