carburetor experts help!

[69chargerdad]

 We will be building a street 440 with the specifications as followed. The 440 is .30 over with a compcams xtreme high-lift series cam with a intake duration of 231 with .525 lift and an exhaust duration of 237 with .525 lift. We will be running about 9 to 1 compression, with headers and the stock intake manifold, and the 906 heads have mild porting. However for the time being we will be rebuilding the old avs carburetor because it is a #'s matching car. the original main jets are.101"S and the secondaries are .095".  What combination of metering rods and jets should i use for the primary's and secondary's, and should use corresponding springs for the metering rods?

[Ghoste]

Do you have the original rods or have you changed them?  You have only two options here.  One is to get an old Carter Strip Kit for an AVS.  The other is to switch over to AFB style rods.  The reason being that an AFB has two step metering rods and the AVS has three step.  The three step ones are much harder to find.
The Edelbrock stuff all uses the two step rods but you need to get the covers for the top of the spring wells too.  The three step ones are dimpled.
So, first off, are we dealing with two step or three step rods?

[69chargerdad]

  I beleive i have the original rods  the manual says  two stage  # 16-545    mine are #  16-575 for both rods

[Ghoste]

I've never heard of a two stage AVS but I'm no expert that's for sure.  Check the covers over the piston wells.  Are they flat or dimpled outwards?

[grouseman]

With that big cam, I don't think the AVS can handle the idle/transition area in it's stock form.  The primaries are going to be cracked waaay open compared to stock, meaning the transition slots will be all used up before you even step on the gas.  You'll have to use the weakest springs you can find for the primary rods if you can get past the idle setup.  Make sure you run FULL manifold vacuum to the dist. to help get idle speed up and the primaries flatter.  Good luck, but you may have to go to a more race-oriented carb. 

grouseman

[69chargerdad]

   i got the dimpled ones   it looks like some one has change them to afb already.     what should i do???       ken

[Ghoste]

Are you sure they are two stage rods?  There is one dimension at the tip and then a single diameter increase?  It shouldn't be a big problem, you just have to make sure you are matching things.  The three stage jet is deeper.  I would get a call into Edelbrock and see about getting a pair of flat covers and then get one of their Performer tuning kits for the Thunder series.  It's essentially an AVS with AFB rods and jets.  Set it up as though it were the small one and start from there.
Incidentally, I checked to be sure and the early AVS was indeed a two stage.

[69chargerdad]

   


alright guys , i can get my hands on a carter strip  kit   what size jets and rods should i start out with??     Is there such a thing as going to big for our combo??           ken

[Chryco Psycho]

oddly jetting woirks backwards to what most poeple think , with a larger engine & good signal vacuum a 440 may want smaller jetting than a smaller engine with a larger cam & lower vacuum so yes you can go too big

[69chargerdad]

Chryco well if we go from a .101 to a .106 woul that be playing it safe or should we start with something lower like a .104

[Chryco Psycho]

I really cannot give you a good starting point from here , just pick a combo generally 3/4 towards the rich end & tkae it for a 5 mionute drive on a highway crusing it not floored &  watch the plug color