ss2haul
May 10th, 10, 10:35 PM
I just bought a remanufactured carter AFB. It has a big brass adjustment screw between the two idle mixture screws. Does anyone know what that screw is for and what is good ball park adjustment for that screw.
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Showalter May 11th, 10, 4:02 PM This might help, Carter tech line 1-800-325-8886 http://www.carburetorfactory.com/expvw04.html <----- Diagram novaderrik May 11th, 10, 4:15 PM isn't there supposed to be a big vacuum port there for the pcv valve? Showalter May 11th, 10, 6:34 PM yeah its that way on my Edelbrock Carb, i didnt think of that, doesnt help im 2 islands away from mine ATM. it might just need a cap over it if you run it to the air filter. could be that bolt is in there closing it up i didnt see where the bolt was on the diagram i posted. sbvelleman May 12th, 10, 10:39 AM Some AFB's came with that screw. It is the Idle Air Speed Screw. http://www.corvettefever.com/techarticles/corp_1003_corvette_carburetor_rebuild/photo_26.html I'm not sure about the adjustment procedure. I did some more research out of curiosity on the NCRS website. One application for that carb ( with the Idle Air S.S. ) was on the '63 Corvette 327/ 300hp eng. It appears the screw was used to fine tune the transfer slots to eliminate a stumble/ hesitation when going from idle to the low speed circuit. | ||