Originally Posted By Cab_Burge
Originally Posted By Jeremiah
Originally Posted By dvw


I believe a 4133 S AFB has a weighted air door, not a spring controlled air door.
Doug


You are correct, it is a weighted air door. We are headed out for a test drive, I'll check back in with some data.


I honestly figure someone had a recipe for this common 575cfm AFB that came on many 383's and 440's.


All the AFB I've seen except some of the early 273 AFB, they didn't have any thing above the venturi confused, have weighted doors. Only the AVS and Thermoquad carbs. have the spring loaded doors scope
As far as having a decent tune up for todays fuel and the different altitudes and weather conditions, your probably going to need EFI to get that done work


You are correct on the air door. We have a few of those kicking around too.

To catch you all up to date we sid take a 20 mile ride and it appears the tip-in hesitation is gone. The roads were wet so I'll have to wait a few weeks to test the accelerator pump and idle-WOT behavior. Once we get some positive results we can all have a laugh when I hook up the wide band.