from comp cams website:
7. I have heard stories about people having issues with flat tappet break in. What does COMP CamsŪ offer to help reduce the chances of flat tappet failure?
Due to federal legislation, motor oils no longer contain certain anti-scuffing agents that played a critical role in flat tappet camshaft break in. While incorrect valve spring pressure and not following proper break-in procedure are often the culprits, the changes in oil formulation have brought about a need for additional steps to be added to the break-in process.
COMP CamsŪ has two ways to ensure proper break-in of flat tappet cams. COMP CamsŪ Engine Break-In Additive (part #159) ensures that the camshaft will have the lubricants that it needs to seat the camshaft journals and lobe/lifter surfaces. This lubricant is poured into the engine crankcase after the camshaft and lifters have been coated with the initial break-in lubricant supplied with the camshaft.
Another option for increasing flat tappet cam longevity is nitriding. Recently COMP CamsŪ invested in a nitriding machine, the first of its kind owned by a major U.S. aftermarket camshaft manufacturer. Nitriding actually hardens the surface of the camshaft and tappet face by injecting nitrogen “needles” into the metal. The result is an ultra-hard surface on the face of the camshaft lobes and lifter face, which greatly improves the performance and break-in process for flat tappet cams. This process is an additional charge for COMP CamsŪ camshafts, but for many extreme duty applications, it virtually ensures proper break-in and increased durability.