Lycoming O-320 76 Series Operator's Manual page 24

SECTION 3 LYCOMING SERIES OPERATOR'S MANUAL
OPERATING INSTRUCTIONS IO-390 SERIES
Figure 3-1. Representative Effect of Leaning on Cylinder Head Temperature,
EGT (Exhaust Gas Temperature), Engine Power and Specific Fuel Consumption
at Constant Engine RPM and Manifold Pressure
3-6