Holley 121-37: 121-37 Tube Nozzle Hole size .037"
https://eltopospeedshop.com/shop/hly-121-37-holley-121-37-121-37-tube-nozzle-hole-size-037-18158
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Tube Nozzles *For 4150/4160/4500 carbs
Tube Nozzle Hole size .037''
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