Holley/AFR question

[cudabob496]

So, on my 12 year old 850 DP, no matter how low I go on the primary jets, I can't seem to get the AFR
above 11.5.  At WOT its about 12.5, so that is good. Did someone recently say I should consider drilling
small holes in the primary butterflys. Seems that might solve the problem?

[Chryco Psycho]

if the idle is turned up a fair bit exposing the ilde transfer slots too much it could run rich or just lose idle sensitivity , drilling holes in the throttle plates help allow more air in while keeping the transfer slots covered

[cudabob496]

if the idle is turned up a fair bit exposing the ilde transfer slots too much it could run rich or just lose idle sensitivity , drilling holes in the throttle plates help allow more air in while keeping the transfer slots covered

hmmm, got idle at 1400.  How many holes, what size, and wear drill on the plates? thanks

[Chryco Psycho]

Start small 3/32 opposite from the idle slots in the center of the throttle plate