The DOHC (Dual-Overhead Camshaft) cylinder head had 16 valves and was made of lost foam cast aluminum. The camshafts were held in the cylinder head with bearing caps and driven by a chain off the front crankshaft sprocket. Motion from the camshafts was transmitted to the 16 valves by direct-acting hydraulic lifters.All LLO engines used MPFI and were rated at 124 hp (92 kW) and 122 ft·lb (165 N·m). The DOHC engine was available on the upper-level model S-series vehicles (SC2, SL2, SW2). A revision of the LL0 appeared in 1999 and used a roller camshaft with hydraulic lifters and rocker arms.
