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3/8-16" Header Bolts 1" UHLHex Head
AF250-10-4
NITRO2HOOD-XL
Carbon Fiber Series Speedometer5"
Standard Main Jet #52 HO122-52 Product:1/4-32" Thread, .052" Hole Size (Pair) 3/8-16" Header Bolts 1" UHLHexStandard Main Jet #521 4 32" Thread, . 052" Hole Size (Pair) HO122 52 122 52 These metering orifices control fuel flow into the metering system. They are rated in flow capacity "cubic centimetres 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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