I seen a number of posts regarding the drilling of air bleeds in the butterflies of Holleys.
Engine is a 502 with a vac sec 750 Holley. Legend pump.
Rich idle, soots up transom.
Another curious behavior is that after cruising around 3-4K RPM and sidesteping foot pedal, the engine simply dies. RPM goes to 0. Restarts OK. Other than this, no other symptoms.
Pulled carb off and throttle plate showing .08-.09 of transfer slot. Idle mixture screw set a 1/2 turn out.
Readjusted throttle plates to .03-.04 slot showing and 1.5 turns on mixture screw.
Restarted engine and won't idle, as the idle speed is too low. I think I need more air.
I am looking for specific info:
1. Where to drill, near the edge or mid-way on the butterfly, or near the shaft?
2. Diameter to start with. .093, .125, or ??
3. Any other recommendations.
thx for your help.