To inspect the camshaft, measure the major and minor diameters of each cam lobe to determine the lobe lift, and if it is 0.005-inch less than specified, replace the camshaft and all lifters or followers. After removing the camshaft, clean it with solvent and inspect the bearing journals for uneven wear, pitting, or signs of seizure; if damaged, both the camshaft and bearings need replacement. Measure the camshaft bearing journals with a micrometer, and if they are more than 0.001-inch out-of-round, replace the camshaft. Check the camshaft lobes for heat discoloration, scoring, chipping, pitting, and uneven wear; if they are in good condition and the lobe lift measurements are as specified, the camshaft can be reused. For lifter inspection, clean the lifters thoroughly and ensure the roller on each turns freely without wear, checking the pushrod seat for wear and fit in the original bore. Press down on the plunger to confirm it operates freely; if lifters show wear or binding, replace them as a complete set along with the camshaft. When installing new lifters, a new camshaft must also be installed, and used lifters should only be installed with the original camshaft in their original locations. Camshaft bearing replacement requires special tools and expertise, so it is advisable to take the block or head to an automotive machine shop for proper handling.