C5SF B 4100 carb boosters

  • I removed the boosters from a (C5SF B) 4100 Autolite i just picked up and looks all original, it has a BA secondary booster and a (KA) primary booster i believe this to be a 65 thunderbird 390 carb ,is the primary K A booster similar in performance flow to an (M) 289 HI PO primary booster

  • I removed the boosters from a (C5SF B) 4100 Autolite i just picked up and looks all original, it has a BA secondary booster and a (KA) primary booster i believe this to be a 65 thunderbird 390 carb ,is the primary K A booster similar in performance flow to an (M) 289 HI PO primary booster

    Chuck, the BA secondary boosters are common to many 4100 carburetors. Do you have an M or MA primary booster to compare your KA booster to for sizes?

    -Fred-

    65 Koupe early San Jose Phoenician Yellow 4 speed
    66 GT Koupe Dearborn Blue 4 speed
    66 KGT San Jose fastback pony interior Silver Frost 4 speed
    64 Falcon sedan delivery 289 4 speed
    65 Ranchero 289 4 speed
    66 Corvette roadster 427/425 4 speed

  • Thanks for the tip fred , i will need to remove it to compare them , whats the best way to measure them, - chuck.

    Precision go / no go pin gauge sets to measure tiny orifices after keeping parts and tools at 73°F (room temperature) for 24 hours first. Industrially our test room was kept at 73°F and 50% RH.

    Dan

  • Dan thank you for your reply and guidance , i dont have those type of measuring tools , i thought of using a magnifying glass that might show some difference between the two, would the M booster have larger orifices than the KA booster,

  • Dan thank you for your reply and guidance , i dont have those type of measuring tools , i thought of using a magnifying glass that might show some difference between the two, would the M booster have larger orifices than the KA booster,

    I do not remember what is different among these parts anymore. The supports have multiple air bleeds and passages in multiple locations.

    Dan

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