The Nissan L series of automobile engines ranges from 1.6 L to 2.8 L in both straight-4 and straight-6 configurations and were produced from 1968 through 1980 (4cly.), and 1970 through 1984 (6 cyl.) It has a 2-valve per cylinder SOHC Non-Crossflow design. The L13, L16, and L18 were all offered as factory engines in 510s from 1968 through 1972. The 6 cylinder motors are quite a bit harder to fit into the engine bay because of their additional length.