7040244 factory specs ?

[Frank400]

I'm about to do some work on a friend's 7040244 (1970 Buick 350), would someone know what the factory specs are, just so I know if it's been modified before Istart ?

   Any help would be appreciated.  Frank.

[carmantx]

I am showing 68 jets, 43B rods, CZ secondary rods,

[Ethan1]

I am showing 68 jets, 43B rods, CZ secondary rods,

 Not quite. 

 69 jets, 44B primary metering rods and BS secondary metering rods are the correct configuration, Frank.

[Frank400]

Thanks.

   opened the one I have here and measured everything.  Here' what I found so far:

main jet: 69
main metering rod: 36B
upper main air bleed: .029" (s.032"mallest I've ever seen so far)
lower main air bleed: .069"

idle tube: .032"
down channel restriction: .055"
idle mixture screw discharge: .070"
upper idle air bleed: .057" (in air horn)
lower idle air bleed: .080

secondary rods: DH
secondary hanger: H

acc. pump discharge: .028"

no idle air bypass

shortest transfer slot I've ever seen at 3/32

[Cliff Ruggles]

I've done a good many of those and haven't seen primary metering rods that small in any of them.

Hopefully you are putting one of out kits in it.  I would also free up the APT screw I the baseplate and install one of our external screws in it, and a set of larger primary metering rods so you can fine tune the part throttle A/F without taking the carb apart.....Cliff

[Frank400]

Surely will put one of your kits in there, Cliff.  Currently working on making some air bleeds adjustable, and yes I'll get one of your special screw for the APT.  Do you have full tapered primary rods for early carbs, like the ones you have for the late carbs ?  ...love  those.  They work wonders with the APT...

   Frank.

[Cliff Ruggles]

We sell the correct length series metering rods for the early carburetors.  They have a slight taper on the upper section, then full taper between the upper and lower section and work perfectly using the APT in those early units.....Cliff

[Frank400]

Got the parts for this carb from you today, Cliff, along with a bunch of other carb parts I ordered from you.  Will let you know the outcome.  First time I mess with the early APT.

     Frank.