Why is the use of a standard camshaft bearing driver and hammer not recommended for aluminum heads?

Using a standard camshaft bearing driver and hammer on aluminum heads is not recommended because aluminum is softer and more prone to damage than steel. The force applied during installation can easily deform the aluminum, leading to misalignment or damage to the head. Additionally, the risk of creating stress points or cracks increases, which can compromise the integrity of the head. It's better to use specialized tools designed for aluminum to ensure a proper and safe fit.