FITS ALL HOLLEY MODEL 2010,2300,4010,4011,4150,4160 &4500
1/4"-32 UNF THREAD
These metering orifices control fuel flow into the metering system. They
are rated in flow capacity (cubic centimeters per minute) and are
changeable for tuning purposes. The shape of the entry, exit, and size
determines flow. All Holley Main jets are flow tested and then stamped
with the correct number.
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