Tap and die sets include a gauge that calculates threads per inch. Select the corresponding die that matches with the reading on the thread per inch gauge, and set the die in the handle that comes with the set.
The IROC-Z model of the Chevrolet Camaro first made its public appearance in 1985 as an add on option to the 1985 Camaro Z28 model. But its origin began long before that. IROC stands for International Race of Champions which is an automobile racing series similar to what NASCAR is.
The third-generation Camaro was produced from 1981 to 1992. These were the first Camaros to offer modern fuel injection, Turbo-Hydramatic 700R4 four-speed automatic transmissions, five speed manual transmissions, 15 or 16 inch wheels, a standard OHV 4-cylinder engine, and hatchback bodies.