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.
In 1970 and 1971, the 10-bolt rear used an 8.2-inch ring gear. The 12-bolt was used only in 1970. BODY The second-generation Camaro's body is all steel and changed only slightly throughout production. The front end sheetmetal and doors interchange from 1970-'77 and '78-'81. The upper portion of the quarter panel changed in 1975 due to the addition of the wrap-around rear window.