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Old 01-26-2008, 10:45 AM
454C10 454C10 is offline
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back firing out the carb is a sign of retarded ignition timing and/or a lean mixture.

with only around 13 inhg of vacuum, i would say you need about 20 degrees of initial timing.

you might also need a bigger accel squirter. pull the one off your holley and read the number off it, then go up 3 or 4 steps.
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