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any extra defense is a necessity
Vintage Series Fined Valve CoversBlack Center Bolt Suit SB Chev
and a powdered metal impeller
Featu res Air-Core meter movement
AF129-05BLK
Standard Main Jet #49 HO122-49 Product:1/4-32" Thread, .048" Hole Size (Pair) any extra defense is aStandard Main Jet #491 4 32" Thread, . 048" Hole Size (Pair) HO122 49 122 49 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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