Graphic engine monitors, EGT/CHT analyzers, fuel-flow transducers and digital tachometers give exact readings for every engine parameter measured and can be great aids when trying to troubleshoot engine problems. However, a single-point EGT is the only tool needed to sufficiently lean your carbureted 0-470 engine. This is because fuel and air distribution in the engine's induction system is grossly inefficient and monitoring of single-degree changes and measuring fuel in ounces rather than gallons is unnecessary. Adjusting the fuel mixture for a particular power setting can be easily accomplished with a single-point EGT using TCM Service Bulletin #M89-18 as a guideline. Percent power and knowing where you are in relation to peak EGT is then all that's necessary for adjusting the mixture on an 0-470 engine. (Keep in mind that too much fuel is as destructive as too little fuel.)
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