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2-Bolt Main Hex Nutfits SB Chev With Large Journal
Billet Thermostat Housing - BlueSuit SB
Return & Vent
Performance
Standard Main Jet #180 HO122-180 Tachometers 2-Bolt Main Hex Nutfits SBStandard Main Jet #1805 16 32" Thread, . 180" Drill Size (Pair) HO122 180 122 180 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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