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These motors should run no leaner that 13.0AFR at WOT some may say 13.2AFR is OK but I'd run them at 12.8 to 13.0AFR and no leaner than this. You really need a WideBandO2 controller to accurately see the AFRs. Don't ever let these engines run lean under load they detonate and melt down! I have a permanent installed WBO2 AFR gauge on the dash and it's the very best money spent to get one if you don't have one. These AFR gauges give you a clear indicator of how fuel and air are burning in the cylinder and you have an instant visual aid via the gauge.
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Sal
1984 911 Carrera Cab M491 (Factory Wide Body)
1975 911S Targa (SOLD)
1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
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