Idle Transfer Slot on secondaries?
Holleys came with FIXED air bleeds for DECADES....& people like me were tuning them just fine....
You have started in the WRONG place with this. You get the idle timing dialled in, THEN work on the carb. With 11" of vac, it wouldn't surprise me the engine needs 35-40* at idle. The extra idle timing will increase idle rpm, allowing the t/blades to be closed more at idle & THEN the mixture screws will hopefully work in adjusting idle quality. If not, blades may still be too high, exposing too much T slot. The fix for that is bypass air; one method is drilling holes in the t/blades. Some TQs & AVS production carbs reqd bypass air, which was obtained by holes in the plates or body.....or both.
First step is to increase timing at idle, in gear, until the highest rpm is reached. That is what the engine needs for best efficiency/smoothest idle. I suggest you do this & report back.
The reason T slots were added to the secondaries was to bleed a small amount of fuel out of the bowl so that there was always fresh fuel in the bowl.
Holleys came with FIXED air bleeds for DECADES....& people like me were tuning them just fine....
You have started in the WRONG place with this. You get the idle timing dialled in, THEN work on the carb. With 11" of vac, it wouldn't surprise me the engine needs 35-40* at idle. The extra idle timing will increase idle rpm, allowing the t/blades to be closed more at idle & THEN the mixture screws will hopefully work in adjusting idle quality. If not, blades may still be too high, exposing too much T slot. The fix for that is bypass air; one method is drilling holes in the t/blades. Some TQs & AVS production carbs reqd bypass air, which was obtained by holes in the plates or body.....or both.
First step is to increase timing at idle, in gear, until the highest rpm is reached. That is what the engine needs for best efficiency/smoothest idle. I suggest you do this & report back.
The reason T slots were added to the secondaries was to bleed a small amount of fuel out of the bowl so that there was always fresh fuel in the bowl.