Standard Main Jet #67 HO122-67 Sandwich Plates 6061-T6 construction means they are

6061-T6 construction means they are prefectly balanced and true

Tread Width: 16

these 15° LS3 Rectangle Port heads are designed to fit LS series engines with a 4

This is economical and saves time but performance wise is lacking compared to point milling

HO0-86670BK

Standard Main Jet #67 HO122-67 Sandwich Plates 6061-T6 construction means they areStandard Main Jet #671 4 32" Thread, . 0663" Hole Size (Pair) HO122 67 122 67 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.