Oh, after years of working on Model "B" carbs, the metering jets do make a difference in higher elevation not necessarily for extreme outside temperature variation (s). Depending on the amount of vacuum your 216 thru 261 draws can at time affect vapor lock. For example a #58 is the only one used by GM for both A/T and standard shift 1954's. However 53, 235's and 216's down 53,52,51 etc. are all over the place. 51,52, 56,57 are common metering jets pending location of original manufacture. Lots more if any of you are having wacky carb problems. Also always remember if you have rebuilt a model "B" and tried to clean that weird white stuff off with carb dip or cleaner spray it will not take it off. Get a lemon and squeeze on juice, it will very soon be gone.
Last edited by Doc.Hall; 02/19/2020 1:27 PM. Reason: did not include one item, see 10/02/20 post
