Holly Carb Tuning

B-Co Kid

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Oct 14, 2010
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87 B-Co; 351w (bored .60); C6 Trans; Holley 570 4bbl

In need of guidance from the carb folks.  I have a digital air/fuel ratio meter with the sensor connected at the tailpipe for readings.  At WOT, air/fuel is spot on at 12:1, under moderate acceleration, air/fuel is ok at15:1, but at cruise speed, air/fuel ratio is around 18:1 which seems fairly lean to me.  Looking at the air/fuel ratio listed for Edelbrock carbs, air/fuel at cruise should be around 15 or 16:1.  I can't seem to find air/fuel ratios for different driving scenarios for Holley.  Are my numbers ok?  If not, how do I adjust cruise air/fuel ratio without messing up other WOT and acceleration values??  Any help is greatly appreciated.

 

Skitter302

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Cruise should be around 13. To my understanding anything above 14.7:1 is lean.

 

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