If the engine has been modified, anything is possible.
However, overheating is a condition that might not be the case. Engines must run hot. If water boils when you put it on the engine, then it definitely is running too hot. Continued use at high temperatures will result in the oil breaking down and metal warping. It may also lead to damage to the piston as these operate at very high temperatures and there is not much margin.
Check the timing. This is a common cause of engine overheating. If overheating continues, try returning the engine to normal specifications.
However, overheating is a condition that might not be the case. Engines must run hot. If water boils when you put it on the engine, then it definitely is running too hot. Continued use at high temperatures will result in the oil breaking down and metal warping. It may also lead to damage to the piston as these operate at very high temperatures and there is not much margin.
Check the timing. This is a common cause of engine overheating. If overheating continues, try returning the engine to normal specifications.