Standard Main Jet #58 HO122-58 Product:1/4-32" Thread, .057" Hole Size (Pair) Pro-Comp Series Pressure Gauge 5423

Pro-Comp Series Pressure Gauge 5423 AU5423 2-5/8"

HO0-80575S

Performer RPM Intake ManifoldBig Block Chevy 396-502 oval port

Holley Performance fuel pumps and modules deliver maximum fuel flow throughout a wide pressure range to support major horsepower

and are available in 1/8"

Standard Main Jet #58 HO122-58 Product:1/4-32" Thread, .057" Hole Size (Pair) Pro-Comp Series Pressure Gauge 5423Standard Main Jet #581 4 32" Thread, . 057" Hole Size (Pair) HO122 58 122 58 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.