I have a Holley 2300 7448 350 CFM 2bbl Carb that has been modified to blow through using the hangar18 mods it has a Percy adjust-a-jet, and center-hung float bowl. SS idle screws w/o-rings, 30cc Accelerator Pump, #31 Accelerator Pump Nozzle and orange Accelerator Pump Cam.

I'm tuning the carb using a aem wideband and my boost/ vacuum gauge, at idle my A/F ratio is set to 14.7 at 21in of vacuum. I'm thinking I need to change the Accelerator Pump Nozzle or Accelerator Pump Cam maybe both. When I barely touch the throttle the A/F ratio drops to 10 and stays there for a few seconds then goes back to 14.7. When I make a pass at wot it will drop down to 10 and stays there for a few seconds then goes to around 13.3 and goes back down to 10.7 at full boost 8 psi.

I was thinking about buying a #28 Accelerator Pump Nozzle, however I dont know if I should change the Accelerator Pump Cam instead or both, maybe just the came or should I just leave it alone?

 

https://www.google.com/search?q=hol...ei=QCrPV-WOI4TPeKqhtIAB#imgrc=eSApeBLx2eCaSM:

may help you a little

 

Thanks! It helped a little but I'm still having a little trouble understanding how to adjust the cam there is a 1 and a 2 on the linkage and there is a 1 and a 2 on the cam. Do I just move the screw the the other hole and line up the cam or to a rotate the came on the shaft do a different position? My orange cam was in hole one and from what I have read that it means I would get a bigger shot sooner and in hole two I would get the shot later is this correct? It looks like the #28 is still to big so I ordered a # 25 and a Accelerator Pump Cam Assortment Kit. I want to lean out the pump shot and as when I driving around town it stays a 10.0 rich and I want to fix that. Cruse is 11.8-12.5 would that be the jets? The PV is Boost referenced at +2 psi

 

yes on the hole question. Rotate the cam counter clockwise so that #2 lines up and put screw back in it.

Here is a link and video that may help

http://www.corvetteforum.com/forums...n-tuning-the-holley-accelerator-pump-cam.html

Good call on getting a kit. You will use them over time

 

Ok now I'm really lost, To put the cam in position 2 do I turn the cam and line hole #1 on the cam with hole #2 on the linkage or do I just line hole #2 on the cam with hole #2 on the linkage?

In this pic I move I lined up hole #2 on the cam with hole #2 on the linkage it moved it a little but no enough to notice any kind of difference in response or on the air fuel gauge.

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