* Extremely poor performance: The engine will likely run very rough, lack power, and have significantly reduced efficiency.
* Valve damage: The rounded lobes won't lift the valves sufficiently or with the proper timing, potentially causing valve float, bent pushrods, broken rocker arms, or even severely damaged valves.
* Engine damage: The erratic operation resulting from the rounded lobes can lead to catastrophic engine failure.
A rounded camshaft is a sign of serious internal engine wear and should be replaced immediately. Attempting to drive the car will only cause further and more costly damage. You need a new camshaft and likely a thorough engine inspection to assess any other damage caused by the failed cam.
