Re: Holley carb 4779-9 problem all of a sudden.
Sounds to me like your needle & seats in the float bowl(s) are not sealing and/or the float levels are set too high allowing flooding of extra fuel from the bowl(s) into the intake manifold. Also your fuel pressure is just a bit on the high side so that doesn't help your situation. 6lbs of fuel pressure is ideal plus or minus .5lbs.
Try checking/adjusting your float levels and if that doesn't cure it, remove the float bowls and check the needle & seats to see why they are not sealing. Regulating your fuel pressure from the 8lbs you have now down to 6lbs will help the needle & seat setups to do their jobs more effectively.
69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at:
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