Quick question...what size squirters are stock on a 4779 (750DP)?

Are the stock squirters sufficiently sized for a 406 small block?

I've got the off-idle Holley bog--the accelerator pump arms are bot set correctly, float level is good. Idle is nice and stable, but still the stumble.

Before I mess with timing, etc, just wanted to see if this was a much "simpler" fix, with the squirter issue.

Thoughts?

update--primaries are 28, secondaries are 31--too small for a 406?

Does this happen at part throttle or full throttle?

Off-idle...I find myself having to "nurse" the gas to avoid the bog, which is no good for the clutch! LOL...

I just picked up 35's on the suirters...I am going to move the 31 form the seocndaries to the primaries (to replace the current 28 squirter on the primary, and put the 35 on the secondaries...

See if that helps at all...

If it happens at WOT I would say increase the squirter size. Your symptoms tell me the accelerator pump isn't providing any fuel for that first fraction of throttle movement. Pull the air cleaner off and just barely move the throttle. I'm not talking 1/8th or 1/16 throttle, I mean where the throttle blades just start to open. At this slight throttle opening it probably won't squirt but you should see some fuel come out.

You might want to buy a Holley Trick Kit. Comes with a bunch of gaskets, squirters, pump cams, power valves, etc. along with tuning instructions.

Got it...the 31 on the primaries, 35 on the secondaries...

Reset initial timing to 12* (total timing is about 37)...idle is @ 750, with 11" of vacuum.

Hesitation/bog is gone! Much more pleasurable to drive, and cleaner to lauch in first gear...

I did put the vac advance back on "ported" vac, but will address that another day when I have a bit more time to do so...

Right now, all is running very well...I think I'll quit for today while I'm ahead

Out of curiosity--will 11" of vacuum be enough to run power brakes?

I once had a blown (rip) in a power valve that caused an off idle hesitation. 8" of vacuum is enough for brakes. Remember when you brake it's when your engine is running higher than idle. At idle/stopped you don't need lots of vacuum for your brakes. If you don't have a vacuum gauge in the car, connect one with a T fitting and long hose to the interior via window and you'll see what your vacuum reading is prior to braking. Your fine at 11". I'm between 9-10" @ idle.

Thanks!