The 6.2 LT1 and 6.2 LS3 are somewhat similar, but come from different small block generations. The 6.2 LT1 is a Gen V small block, while the LS3 is a Gen IV small block. Despite their identical displacements, the LT1 shares almost no internal components with the LS3. The LT1 features higher compression and better overall performance. It also implements a number of modern technologies like direct injection fueling, infinite variable valve timing, and active fuel management.