EGT for mixture setting

[ARTHUR OKUN]

the 50*f produces more power than peak egt i was told to NEVER run lean 
of peak because  it can cause valve and cylinder overheating how about 
measuring head temp  . the extra fuel  is used to improve valve 
cooling.
if no egt is availible  leaning to roughness and then richen till she 
runs smooth works fine   with a cs prop it works fairly well because
the tach  will not show anything below a dramatic power loss
summit automotive has some fairly low cost egt units in there latest 
catalog. for much less than aircraft types.