The DOHC cylinder head had 16 valves and was made of lost foam cast aluminium. 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.
LL0 cylinder heads were changed slightly in 1995, when Saturn adopted electronic, linear EGR mechanisms, over the previous vacuum actuated design. The head casting was changed to accommodate different mounting surface of the new valve.
All LL0 engines used MPFI and were rated at 124 hp (92 kW) at 5600 RPM and 122 lb·ft (165 N·m) at 4800 RPM.[3] The DOHC engine was available on the upper-level model S-series vehicles (SC, SC2, SL2, SW2). A revision of the LL0 appeared in 1999 and used a roller camshaft with hydraulic lifters and rocker arms, but power was unchanged. Also for 1999 provisions for a new air injection reaction system was introduced aimed at improving engine emissions.[WIKI]
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