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Cobalt Series Water Temperature Gauge 7931 AU7931 2-5/8"
Designed and calibrated for optimum street performance in small-block and big-block engines with Performer RPM
Performer RPM Intake ManifoldBig Block Chevy 396-502 oval port
A great cooling aid
AF932-08S-25
Standard Main Jet #58 HO122-58 Product:1/4-32" Thread, .057" Hole Size (Pair) Cobalt Series Water Temperature GaugeStandard 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.
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