I was looking over Slant Six chapter in “Mopar performance parts Six Cylinder Enginesâ€￾, by Daimler Chrysler, page 293.
4- Bbl. Set-Up (General Purpose use) Holley List 6299 which is a predecessor to the 8007, 390 cfm carb.


Carb Specs:

Primary jet #49, Secondary #52, Power valve 6.5. I tried #51jet, but caused lean surging at steady speed, now have #53 jet installed. I don't have a #52 on hand)

PV Channel restriction 0.052â€￾---- What is this?

Idle Air Bleed: 0.078â€￾

High speed Bleed: 0.043â€￾ ---- This bleed is plugged on my carb, and looks to be factory. Would this be one of the causes of rich light throttle flat running that I can’t seem to tune out? 8007 does not have removable air bleeds, can one drill and press in a .043â€￾ bleed?

The secondary circuit has both idle and high speed bleeds that are of equal opening, perhaps half of the primary’s idle bleed size of .043â€￾

_________________
67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

I have a 6299 sitting on my bench and it's nothing like the 8007...the 8007 has much more updated items to work with, and the 6299 was meant to work primarily with the Pinto 4 cylinder of the day...like all Ford style carbs (including Holley 0-1848) it has no provision at the carb base plate for a PVC hook up.

The Power Valve Channel restrictions are the two holes in the cone shaped throat where the power valve screws into...if the valve flow
amount is inadequate for your application (usually think HP 440 with
a 950 cfm holley...being treated to a Holley 600...), then you will need to drill them...usually before you do that you drill the block orifices from the main wells, or drill the inserts in the main well (you have to drill the plugs out of the block and solder the holes when done...if you screw up you buy a new block and start all over again).

Yes, there are kits that will allow you to drill and thread the orifices to use weber jets, or other items...Personally the orifices are spot on, if you plug the high speed bleed the mains come on about 1800-2000...and it gets worse form there if they open up (I've had to put a paperclip in the high speed bleeds on the Holley 600 to get the mains to come on just right for the hyperpak slant six).

Try to take that book to heart...those settings were fine in 1977 when that carb was at it's highpoint and the 8007 wasn't on the map yet, and much has advanced since then...

Given your situation it's too bad the mile dial and 1/4 mile dial kits are no longer available, the mile dial would be the ticket to adjust the jetting as needed from your drivers seat...

-D.Idiot

Thanks DI,
I’m not clear where this real state is located on the metering block.

So what I’m gleaning from this is opening up high speed air bleed will retard the mains coming on line.
So at 2000 rpm that main jet is serving up fuel via the boosters, and it is not just the transition circuit supplying fuel.
So an 8007 comes from the factory with blocked high speed bleeds?

_________________
67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC