OK, well there must be some confusion here…The 57 models did not used fixed jets, so if your engine has a fixed high speed jet then someone has messed with the carb, or perhaps the engine is not a 1957 model. Can you post some pictures for us? If not, you can email them to me at
old email address removed
I will post them.
PS- That thick nozzle gasket is supposed to get crushed a bit when the bowl is installed, so this is not your issue unless the old gasket is flaking apart plugging up passages in the carb.
